MULTIFUNCTIONAL: This strengthener ball can be grip training, finger training, hand back massage and so on, make fingers become stronger, can help elder add repetitions to reap additional .
MATERIAL: Sponge, with high elasticity, very comfortable to use and also quick in rebounding, suitable for hand opening expansion, finger strength boosting, palm support and wrist .
4PCS IN 1 PACK: There are 4pcs training ball with different sizes, these hold the exercise ball in your hand when playing the piano, which will help studying the correct fingering.
EASY CARRYING: Comes with a compact size and a light weight, you can easily carry the ball to exercise anytime and anywhere, convenient and , with strong compatibility.
MULTI-FUNCTIONAL GRIP BALL: Hand training device: programmer, writer, musical instrument player; There are four size can choose, it is fit for different people.
