H&Ouml;TER Resbo Sports Xpower Gyro, Wrist Exerciser Wrist Ball, With Shining Light And Speedmeter, Purple Perfect for golfers / musicians / squash / tennis / fencing / basketball / badminton / archery / cricket 250Hz Pro Powerball comes with a digital speedmeter/counter Relax yourself / Release stress and strengthen your arm/wrist/hand Product includes the start-rope / wrist strap / powerball bag Ages 14 years and up