INTBUYING 3PC Hand Therapy Exerciser Balls Squeeze Balls Kit Stress Relief For Hand Training, Physical Therapy, Injury Rehabilitation Resistance Hand Grip Balls Appearance is simple, feel soft. Can exercise the head muscles and flexibility of the fingers. also a perfect tool for anyone in the family to use and great for progressive training. Can be repeatedly compressed without losing its shape. Durable & high-elastic material, feel flexible, good elasticity,suitable for all ages. Three color-coded balls of varying resistance(Include :red blue yellow).