TopSpin Whistle Available in: White

Available in: White

Diadem Premier Balls are sanctioned and approved by the ITF

thicker gauges push durability further

and longer lasting playability

TopSpin Whistle Available in: WhiteThe TopSpin Whistle: Instant Feedback for a Heavier Ball Stop guessing if youre getting enough "brush" on the ball. The Spin Whistle is a simple, racket mounted tool that gives you a clear audio cue the moment you hit the correct swing path. How it works: If you hear the whistle, youve nailed the acceleration. If its silent, youre not hitting with topspin. Its that simple. By turning your technique into sound, you can fix your swing in real time.