Head

Sonic Pro 17g Strings Black

$11.00
Shipping calculated at checkout.
Item # 43613
5+ in stock, ready to ship
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281028-17BK:SET

Made from uniquely refined co-polymer polyester with a soft molecular construction, the new Head Sonic Pro string offers superior control and touch for extra pop and spin. This exceptionally durable string offers excellent response and playability that meet the demands of todays best players. Sonic Pro is one of the softest polyester strings on the market.

Gauge: 17 / 1.25 mm

Length: 40' / 12.2 m

Composition: Monofliament Copolymer Polyester

Color: Black

Need help selecting a string? Check out our Choosing The Right Tennis String Guide for more assistance.

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: 4.4 / 5 from 10 reviews.

AI Generated Review Summary

Summary topics

Review topics: ["feel","durability","control","string","balance","playability"].

Review highlights

Reviews

Good Bang for the Buck

"I went back to a monofilament after using Wilson NXT for awhile. This string has nice a good balance of playability and durability. The play of the NXT was a little better but it frayed quickly. It was not worth the extra expense for a 3. 5 player. The Sonic Pro is a good budget choice."

Charles O. (4/5)

Sonic pro 17 strings

"The these strings give enough bite to provide e good spin and control and are durable enough for request recreational play without losing their playability"

Paul S. (4/5)

sonic pro

"Nice long lasting string. Lacks a bit feel, but worth it, due to longevity."

Harry O. (4/5)

Sonic Pro

"This a really good string and priced good. Durability is great and get good control."

Robert G. (5/5)

Great all around string

"These are great strings for a combination of power and control. Im a 5. 0 player and I find Sonic Pro to give me a lot of pop on my ground strokes and serve, while still having a lot of feel and ball control. The strings also have incredible durability, lasting me 6-8 weeks when playing 3-4 times a week."

Lawrence F. (5/5)

Great String

"Great feel"

Juan (4/5)

Good Spin, Bad Mainenance.

"I got this string as a reckomendation from a friend, The string is very soft and extremely durable. I can produce quite a bit of spin and control. My only problem is that withing a week or so, it feels like a fish net. Im able to adapt to it, but it is more change than what I would like."

Andrew S. (4/5)

Spin & feel

"This is the softest poly string that I have played and I have played several. It does not hurt my arm yet I get the kind of spin and feel that I am looking for. I also do not have to worry about breaking stings often as we ordinary nylon string. If you want more spin but with the feel and comfort of non-polyester try this one."

John M. (5/5)

Head string sonic

"I have used the FXP string for several years and was very satisfied until I accidentally came across the Sonic Pro. It has a nice feel. I am able to impart spin. I have two Youtek Radical racquets and I have one strung with the FXP power and the other strung with the Sonic Pro. I notice that I choose the Sonic Pro strung racquet when I play against the high bouncing steady player. I am able to underspin the ball and drop it short during a long rally with a great amount of success."

Leslie (4/5)

Great strings

"I use these with FXP for a great overall feel and ultimate control. Never played better."

Ty (5/5)

Q&A