Yonex Poly Tour Rev 17/1.20 Tennis String (Mint) 21 Inch there is now an RPM

there is now an RPM string for you

21 and 23 inch junior tennis racquets

By modifying SuperNick XL's unique construction of nylon multifilament core and double-braided multifilament jacket

Advanced-level players who need just a touch more pop will absolutely love how this racquet performs on the court

Yonex Poly Tour Rev 17/1.20 Tennis String (Mint) 21 Inch there is now an RPMDelivering intense bite and control with new technology, Yonex Poly Tour Rev 16 tennis string is prime for adding spin to your game. Baseliners that have medium to fast swing speeds can take full advantage of the string's octagonal shape and intense bite on the ball. What makes this string stand out is the new SIF (Silicone oil Infused Filament) technology to improve spin and snapback. Combining SIF with the string shape creates a faster moving string