2025 DeMarini Whisper (-9) Fastpitch Softball Bat: WBD2545010 (DEMO)

Name: 2025 DeMarini Whisper (-9) Fastpitch Softball Bat: WBD2545010 (DEMO)
Brand: DeMarini
SKU: WBD25450102433
Price: 449.95 USD
Availability: OutOfStock

The 2025 DeMarini Whisper (-9) Fastpitch Softball Bat (WBD2545010 DEMO) features a rose gold and black design, patterned grip, textured swirling barrel with Continuous Fiber Composite, shown against a plain white background.

The 2025 DeMarini Whisper (-9) Fastpitch Softball Bat (WBD2545010) features a pink, white, and black barrel with geometric grip patterns and Amplified Gapped Wall Barrel technology.

The 2025 DeMarini Whisper (-9) Fastpitch Softball Bat (WBD2545010 DEMO) features a pink and white swirling barrel design, patterned grip, and durable Continuous Fiber Composite construction, displayed on a plain white background.

The 2025 DeMarini Whisper (-9) Fastpitch Softball Bat (WBD2545010 DEMO) features Amplified Gapped Wall Barrel technology and a white and pink design.

A round, black object featuring geometric cutouts reminiscent of the 2025 DeMarini Whisper (-9) Fastpitch Softball Bat (WBD2545010), its design echoing the bat's futuristic Amplified Gapped Wall Barrel pattern for a strikingly modern look.

The 2025 DeMarini Whisper (-9) Fastpitch Softball Bat (WBD2545010 DEMO) features a black handle with a pink pattern, a white barrel with pink and red splatters, and is crafted from Continuous Fiber Composite for top performance.

A round object with a white and pink marbled pattern and a central black-and-white emblem showing 33 over 24 oz in a home plate shape, echoing the iconic design of the 2025 DeMarini Whisper (-9) Fastpitch Softball Bat: WBD2545010 (DEMO).

Find the bat to fit your swing! While we do not have cages on the premises we do offer a "Try to Buy" Demo Program. Bats are expensive and we want to make sure you get the right one! We have Baseball and Fastpitch Softball bats available to try. Our Demo Program is designed to help players find their favorite bat before buying one from us. We have specific demo bats that you try and then you buy a brand new bat with a warranty!

DEMO BATS are available IN STORE ONLY

Contact Us to See if the Bat & Size you're looking for is available that day! Please Call us at 810-629-0718 for the fastest response.

SHOP THE NEW IN WRAPPER VERSION

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Advertisement for Diamond Sport Gears demo program, featuring baseball and softball bats from top brands, with images of players, bats, store info, and Available in Store Only banner.

Try to Buy

Diamond Demo Program

Find the bat to fit your swing! While we do not have cages on the premises we do offer a "Try to Buy" Demo Program. Bats are expensive and we want to make sure you get the right one! We have Baseball and Fastpitch Softball bats available to try. Our Demo Program is designed to help players find their favorite bat before buying one from us. We have specific demo bats that you try and then you buy a brand new bat with a warranty! All Demos are Available In Store Only.

We have 2 Ways to Try Bats at Diamond Sport Gear!

PAID: Checkout bats for 4 Days
FREE: Try them on Site (Weather Permitting)

DEMO FAQs

We have multiple new models from most manufacturers we sell. Unfortunately they limit how many we can get so we do not have every bat in every size. Contact us or come in to see what is available. We have Demos available from the following brands:

Louisville Slugger
DeMarini
Marucci
Easton
Rawlings
Axe Bat
Mizuno
Warstic
Dudley
Victus
Stinger

Come in and select up to two (2) bats from what we have available to demo. It costs $40 per bat and you can have them for up to four (4) days. At the time of demo we will place a Diamond Demo Credit(s) on your receipt. Do not lose them! You will have 30 days from your rental date to use them on your bat purchase. Each time you try a bat you get credits worth $30 OFF your Bat Purchase and must be presented at the time of purchase. When you are checking them out we get a copy of your drivers license and take an imprint of a credit card in case you don't return the bats. If you BUY a bat it still only costs you $10 to try one!

Bring your own Net to hit into and Balls to try as many bats as you'd like! Weather permitting of course. We have a grass area in our plaza that we allow people to set up and try bats. We hold a Credit Card & Drivers License in store while you try. Doing this method allows you to try as many different bats as we have available that day! We do NOT charge for those that want to try our bats on site.

PAID CHECKOUT: It is $40 per bat

FREE TRIAL: Free to try on site

PAID CHECKOUT: Up to Two (2) Bats

FREE TRIAL: Try as many bats as you'd like on site that we have available

PAID CHECKOUT: Four (4) Days

FREE TRIAL: Anytime during our business hours. We ask that you try to be done 30 minutes before we close.

Yes, but we will only hold bats for the day. Call the morning you are coming and we can have bats waiting for you when you get here! We will NOT hold bats multiple days as it is a widely used program.

Any of our bats, even new in wrapper can be taken outside to dry swing! You can at least get a feel for the bat before purchase or demoing a size close to what you'd like!

You or someone with you must be 18 years or older, with a valid ID to Demo any Bat(s).

Yes! Bring in your receipt with your Diamond Demo Credit(s) at the time of purchase. You will get a discount for every credit you have.

The Diamond Demo Credit is a sticker that will be placed on the back of your receipt for each bat that you demo. You MUST present them at the time of bat purchase or NO discount will be given.

Credits can only be used on In Store Purchases.

Yes. Due to the popularity of the program we have to have them back after a strict 4 days so others can try them.Failure to return demo bat(s) in 4 days will result in a $20 per day late fee & 1 Rental Strike. $20 will be charged per day for up to 6 days, resulting in a total of 10 days that you have the bat(s). After the 10th day your credit card will be charged the accumulated late fees plus the FULL MSRP price of the bat(s).

Each time you go past the 4 days you are given a Rental Strike. Once you accumulate 3 strikes you can no longer use our demo program.

2025 DeMarini Whisper (-9) Fastpitch Softball Bat

The dominant fastpitch bat with an Amplified Gapped Wall Barrel & Continuous Fiber Composite for elevated performance.

A woman with blonde hair in a ponytail stands with her back to the camera, holding a baseball bat across her shoulders in a dimly lit setting.

Amplified Gapped Wall Continuous Fiber Barrel

All-new inner and outer walls with a larger gap increase performance and create a brighter sound on contact.

Anomaly Connection

Pairs the barrel with a stiff, composite handle to offer feedback while maximizing comfort, bat speed and energy transfer on contact.

A person’s hand gripping the handle of a maroon and white baseball bat, with the rest of the background dark and out of focus.

Continuous Fiber Composite Barrel

We rolled one sheet of super strong composite rolled into itself, and the result was a lighter, more durable barrel with an enormous sweet spot. No excess, no breaks, just unbelievable power.

2025 DeMarini Whisper (-9) Fastpitch Softball Bat

The strongest hitters in high school and college softball elevate extra-base hits with the 2025 Whisper (-9), a Rose Gold fastpitch softball bat engineered with an Amplified Gapped Wall Barrel for the ideal combination of responsiveness and power. Designed with space between inner and outer barrel walls to trampoline the ball on contact, the 2025 Whisper (-9) Fastpitch Softball Bat helps dominant players in the heart of the order convert their elite bat speeds to doubles, triples and home runs. DeMarini engineers constructed Whisper’s barrel with Continuous Fiber Composite materials, a process that results in extremely consistent performance to hang crooked numbers on the scoreboard. Whisper’s two-piece composite construction, complete with an Anomaly Connection System and trumpet-shaped handle, offer a stiffer feel than other DeMarini bats while dampening vibration, empowering advanced high school and college players to swing big.

Amplified Gapped Wall Continuous Fiber Barrel: All-new inner and outer walls with a larger gap increase performance and create a brighter sound on contact.
Two Piece Composite Construction: Designed for improved weight distribution that allows for great balance, bat speed and barrel control.
Continuous Fiber Composite Barrel: We rolled one sheet of super strong composite rolled into itself, and the result was a lighter, more durable barrel with an enormous sweet spot. No excess, no breaks, just unbelievable power.
Anomaly End Cap: A blend of durable and lightweight materials maintains barrel integrity and optimizes performance.
Anomaly Connection: Pairs the barrel with a stiffer handle that offers positive feedback on contact and a seamless energy transfer.
Balanced Swing Weight for total barrel control
0.840" Trumpet Handle: Stiffer feel for strong hitters to generate more power on contact.

Name	SKU
WHISPER (-9) 2025 2332	WBD25450102332
WHISPER (-9) 2025 2433	WBD25450102433
WHISPER (-9) 2025 2534	WBD25450102534

We recommend starting with a length based on a player's height and weight as seen below. These charts simply serve as a starting point. As far as the best weight, it will vary from player to player depending on one's personal preference, age, hitting style, bat speed, and strength. Typically we recommend the longest and heaviest bat that you can swing without losing bat speed or affecting your swing. The FEEL of the bat will be the most important factor. You have to make sure it feels right to you. The more you like it the more confident you will be at the plate!

HELP DECIDING BETWEEN TWO SIZES

Longer/Heavier Bat: Will be better for players that are growing but can cause a dip in their swing. Also it moves the sweetspot of the bat further away from the player which can cause more miss hits. For a growing or younger player that can handle the heavier bat without issue compared to the lighter, it is best to go with the longer/heavier bat.
Shorter/Lighter Bat: Will give far more control of the bat, and keep the sweetspot closer to the player. They can always adjust in batter's box. The down side for growing players is you might have to buy more bats over time. Tony Gwynn, one of the greatest batters in MLB history and a grown man who weighed well over 200lbs, used a 32 ½ inch bat the majority of his career. It is not always better to just keep sizing up.

Most Popular Length by Age

AGE	5 to 7	8 to 9	10	11 to 12	13 to 14	15 to 16	17 & Up
LENGTH	24-26"	26-28"	28-29"	30-31"	31-32"	32-33"	33-34"

Bat Sizing Chart

WEIGHT (Pounds)	HEIGHT (Inches)
WEIGHT (Pounds)	36-40"	41-44"	45-48"	49-52"	53-56"	57-60"	61-64"	65-68"	69-72"	73"+
Under 60	26"	27"	28"	29"	29"
61-70	27"	27"	28"	29"	30"	30"
71-80		28"	28"	29"	30"	30"	31"
81-90		28"	29"	29"	30"	30"	31"	32"
91-100		28"	29"	30"	30"	31"	31"	32"
101-110		29"	29"	30"	30"	31"	31"	32"
111-120		29"	29"	30"	30"	31"	31"	32"
121-130		29"	30"	30"	30"	31"	32"	32"	32"
131-140		29"	30"	30"	31"	31"	32"	32"	32"
141-150			30"	30"	31"	31"	32"	33"	33"
151-160			30"	31"	31"	32"	32"	33"	33"	33"
161-170				31"	31"	32"	32"	33"	33"	33"
171-180						32"	33"	33"	33"	33"
181 & More							33"	33"	33"	34"

If you need some help please Contact Us or come into the store and we will size you for a bat. While bats can have the same measurements they often feel different and it's beneficial to take some swings with them at the store.

If you are local, check out our Diamond Demo Program to find a bat to fit your swing!

IMPORTANT BASEBALL BAT RULES

Baseball unlike Fastpitch Softball has certain Drop (Length-to-Weight Ratio) requirements per age group. It is important to keep track of these as there is a certain point over 4 years where you have to have a different drop each year. If you can swing the heavier earlier without hurting your swing it can be beneficial.

12 & Under (12u): Any Drop
13 & Under (13u): Must be a DROP 8 or Heavier
14 & Under (14u): Must be a DROP 5 or Heavier
15 & Under (15u): Must be a BBCOR (Drop 3)
High School (Regardless of Age): Must be a BBCOR (Drop 3)

LENGTH-to-WEIGHT RATIO

The ''DROP'' as some may call it, or the number with the MINUS in front of it is the LENGTH-to-WEIGHT ratio. This defines the difference between the length of the bat in inches and the weight of the bat in ounces. The larger the number, the lighter the bat.