Good String All Around
"I love this string and its my personal favorite, I have to try Confidential Soft though but the only caveat to this string is the durability, i feel like I pop this way faster than a traditional confidential or toroline."
Solinco
SOLMACH10:SET
Mach-10 Tennis String is Solinco’s newest shaped co-polyester string, engineered for explosive power, superior feel, and long-lasting playability. At its core is the CloudFORM technology—an innovative chemical formulation that gives Mach-10 its best-in-class power, comfort, and tension maintenance.
Mach-10 breaks away from Solinco’s “big three” to introduce a new family of feel-driven, high-performance co-polyester strings. With a completely new composition, it captures the best qualities of its predecessors while elevating feel and control. Its pop and pocketing produce a signature sound, bringing a new dimension to its performance.
Construction: Co-polyester
Gauges: 16/1.30mm | 16L/ 1.25mm | 17mm/1.20 | 18 / 1.15mm
Color: Light Blue
Length: 40 ft / 12.2 m
Any original shipping fees are none refundable.

| 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 |
| 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.
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: 4.75 / 5 from 12 reviews.
Review topics: [].
"I love this string and its my personal favorite, I have to try Confidential Soft though but the only caveat to this string is the durability, i feel like I pop this way faster than a traditional confidential or toroline."
"Very good string for Ezone 98"
"Currently using in a Head Gravity Tour. Great blend of power and control"
"I have been an avid user of Solinco hyper-g string - both the regular and soft versions. I tried the Mach-10 on a whim and am thrilled that I did. While I really like the playability of the hyper-g, the Mach-10 is just as responsive but, in addition, is aside on my arm and has the most comfortable sound upon impact that I have experienced to date. I use the 18 gauge. Give it a try. You won’t be sorry."
"Nice feel."
"Great string. It needs to last longer or get hybrid with syn gut to extend play life."
"This string was recommended to my daughter, who is a college player, and for her to consider as part of a hybrid set up with NRG2. She LOVES NRG2, the control, spin, power - balls drops where she needs it too. And although this combination took some getting used to, she really likes it. It's comfortable for her arm, adds some extra power, greater durability - but overall, after the adjustment period, she's enjoying it and notices the differences less."
"Great String with affordable price"
"Strung in mains. Good durability and tension hold."
"Love the feel and bite but not that durable. 16 gauge strings usually lasts 2-3 months for me. Thus one broke at 2 weeks."