Head Sonic Pro Tennis String Set of Black 17g 1.25mm Running Shoe High swing speeds - fibers

High swing speeds - fibers stiffen for more control

Do your multifilament strings break too quickly

a proprietary rubber-like material emphasizing elasticity in the frame’s flex

the next generation of our acclaimed racer features a new gender-tuned enhanced fit and sustainable construction to help bring new meaning to speeding towards tomorrow

Head Sonic Pro Tennis String Set of Black 17g 1.25mm Running Shoe High swing speeds - fibersThe monofilament SONIC PRO string is designed for club players who need a durable, comfortable string. Your weekend games and weekly training sessions require a durable string. Try SONIC PRO. Made of unique co polymer polyester in combination with a soft molecular construction, it provides great touch and a comfortable feel while giving you a lot of power for a monofilament string. 12 m 40 ft