Finger Strengthening Exerciser Balls Design: This finger ball exerciser has just the right squeeze to strengthen our hand. These hand strengthener grips are very effective for keeping the ball in hand during exercise, didn't bind, and didn't interfere with the alignment of fingers during use. 👋Customized Individual Five Fingers Buttons: Easily adjustable for each finger to increase the force required to press each plunger and the silicon rubber pads are comfortable on the palm and finger tips.