Gamma

Shockbuster II Tennis Dampeners

$5.99
Shipping calculated at checkout.
Item # 149240
Color: Blue/Black
5+ in stock, ready to ship
  • Easy Returns
  • 3.7+ Million Happy Customers
  • Fast Shipping

AGSB2

The Gamma Shockbuster II Tennis Dampeners is engineered with an improved no-leak Zorbicon gel to more effectively protect from a wider range of vibration. With a "worm" design, the Shockbuster II features a dual-tube design that contacts the critical main strings for increased dampening.

Product information

FREE SHIPPING ON ORDERS OVER $50 (before taxes)

  • Valid in the 48 Contiguous U.S. only. Limited time offer. Applies to In-Stock items.
  • Order must have an actual or dimensional weight of 7 pounds or less.
  • Offer not valid on oversized or heavy items (cases of balls, can of balls, demo racquets, etc.).
  • Not Valid on drop ship items like stringing machines and ball machines.
  • Orders do Not ship or deliver on Saturday, Sunday or select Holidays.
  • Most Orders placed by 3pm CST will be shipped that day.
  • Any original shipping fees are none refundable.

  • Customers will be contacted via email or telephone with order issues or shipping delays.
  • Please provide contact information where you can be reached quickly.
  • Not responsible for weather-related delays.

FREE RETURN SHIPPING WHEN $50+ ORDER VALUE MAINTAINED

  • Please CLICK HERE for information about returns.
From To   Standard Ground* 2Day Next Day
$0.00 $49.99 = $5.95 $15.95 $29.95
$50.00 $149.99 = Free $15.95 $34.95
$150.00 $199.99 = Free $19.95 $39.95
$200.00 $9,999.99 = Free $19.95 $39.95

Alaska, Hawaii, Puerto Rico, Guam, US Virgin Islands, APO Addresses

From To   USPS Priority*
$0.00 $99.99 = $19.95
$100.00 $199.99 = $39.95
$200.00 $9,999.99 = $49.95

Orders being shipped outside of the Contiguous US or APO addresses will ship by means of the United States Postal Service (USPS) and in some cases FedEx.

**Shipping via USPS Priority provides minimal tracking information and normally delivers within 5-7 business days.

*** Any shipping promotions offered by Tennis Express DOES NOT apply to shipments outside of the contiguous 48 states.

**** Excludes tennis balls, court equipment, stringing machines, ball machines and all oversized items.


Canada, Mexico, and other International Orders

At this time, Tennis Express only ships to the United States and all US Territories including Puerto Rico, US Virgin Islands, Guam and military bases.   Due to manufacturer restrictions, we are unable to ship to countries outside of the United States. 

Return Policy

Tennis Express believes in providing our customers with the best selection of tennis products and innovative game improvement gear. If the products are not to your liking, please take comfort in knowing you can return or exchange unused products within 30 days of the delivery date. Used or worn product is ineligible for a Refund. However, Tennis Express may issue a partial store credit for product returned in a used or worn condition. Credit is at the discretion of Tennis Express based on the amount of wear and use on the product. Store credits expire after 90 days.

How to Return

Submit a return request by visiting Return Portal.

1. Log in with your order number and email.
2. If your order has more than one item, select the items that you want to return.
3. Select the item condition and reason for return. Optionally add any comments.
4. Save and continue to return options.

Once your return request is approved, you'll receive an email with a label or QR code for your FedEx return label and shipping instructions. After the product is returned, you receive a refund.

To qualify for a FREE prepaid FedEx Ground return label:

* Your order must be over $50 (before tax and any shipping fees).
* After your return, the value of what you keep must still be over $50 (before tax and any shipping fees).
* Limit 1 free return label per order.
* Valid only for the continental United States.

Example: You place a $75 order and return a $30 item. Your remaining total is $45, which is under $50, so this order does NOT qualify for free return shipping.

If your order does not qualify for free return shipping, you can still use our return portal for a flat $6.95 fee, which will be deducted from your refund. Otherwise, you're responsible for shipping items back to us, so please hold onto your tracking information.

Please note:

* If you use one of our prepaid labels, you may drop the shipment off at any authorized FedEx or USPS Service Station.
* Refunds will be processed within 3-5 business days from the day we receive the return.
* Any original shipping fees are non-refundable.
* Any store credit issued will expire within 90 days.

QUESTIONS: If you have any questions about our return process, please contact us before shipping back your return: [email protected]

Apparel Returns and Exchanges

* Apparel must be unworn, unwashed, and unused with original tags attached.
* For safety concerns, we cannot accept used or washed clothing.
* Accessories must be unworn, unwashed, and unused with original tags attached.
* Apparel items carry NO warranty from the manufacturer.

Shoe Returns and Exchanges

* Shoes must be in NEW and unworn condition with original product packaging.
* DO NOT use the original shoe box as the outer shipping box. This will ruin the product.
* Accessories must be unworn, unwashed, and unused with original tags attached.
* For shoe outsole warranty claims, please visit our Shoe Warranty page.

Final Sale Notice: All Clearance Shoes and Apparel are Final Sale and not eligible for returns or exchanges. 

Racquet and Paddle Returns and Exchanges

* Racquets or Paddles must be in NEW and unused condition with original plastic covering the handle intact.
* Make sure any racquets or paddles are protected to safely endure shipment.
* For racquets strung at Tennis Express, the cost of the string will not be refunded.
* All sales are final on the purchase of used racquets.
* For racquet warranty claims, please visit our Racquet Warranty webpage.

Drop Ship Returns

* Items shipped directly from the manufacturer must be returned to the manufacturer within 30 days of the original delivery date.
* You must request a Return Authorization (RA) from Tennis Express prior to shipping. Please email [email protected] with your return request.
* Drop shipped items must be in new and unused condition with original product packaging.
* Any restocking fees or return shipping costs will be paid for by the customer.

Damages and Issues

Please inspect your order upon reception and contact us immediately if the item is defective or damaged, or if you receive the wrong item, so that we can evaluate the issue and make it right.

Unfortunately, we cannot accept returns on gift cards.

Last Updated 05/07/26

Overall rating: 4.4347825 / 5 from 23 reviews.

AI Generated Review Summary

Summary topics

Review topics: ["dampener","products","shockbuster"].

Review highlights

Reviews

Weird noise.

"Weird noise."

Samuel H. (3/5)

Failing

"They keep breaking too easy"

PAUL H. (5/5)

Stays in place!

"Once you get it installed on your racket it stays put!"

ROBIN H. (5/5)

Gamma shock buster 2 busted

"These dampness break too easily. . . they work very well but only last a short time. This can be very frusterating. Have to buy them in bulk. :/"

T E. (3/5)

Love These

"These are the best dampeners out there!"

Brian A. (5/5)

Nice products!!!

"Great product. . . love Gamma products!!!"

William C. (5/5)

My favorite dampener!

"So far I have no complaints about the Shockbuster II. It does an excellent job of dampening the strings which I happen to like and I have had no issue with the dampeners coming undone its happened a few times, but Ive been using them for quite awhile. Im also quite happy with Tennis Express as an online retailer catering to the sport. They are one of my go to places on the internet for tennis gear."

Andrew L. (5/5)

Prefer Shockbuster I

"I prefer the original Shockbuster! These were harder to put on. That being said, I feel like BOTH iterations of the Shockbuster are worlds better than the circular-ish dampeners, and the II dampened a smidge more than the original. Also, I felt both raised the stringbed tension just a little bit the II doing so just a little bit more than the original."

Jeremy A. (4/5)

GAMMA-Shockbuster-II-Tennis-Dampeners-32540

"I love it and it is the only one I use. Keeps my strings in place and helps my elbow."

Marcela E. (5/5)

Works well - like the original better

"This is basically the original but with two stuck together. I dont really hear or feel a difference, so Im not sure it is worth the additional cost over the original."

Ty C. (4/5)

Q&A