Funvalley Surperfect Hand Exercise Stress Balls, Stress Relief Balls, 3PCS Gel Hand Balls and 3PCS Finger Stretcher, Hand Grip Strength Trainer, Increase Strength Improve Dexterity
Hand grips strengthener are made of high-quality Thermo Plastic Elastomer(TPE) and food-grade silicone, after repeated compression, hand stress balls can still maintain its original shape.