Motivational stress balls: : Three stress balls in a package. These stress balls are designed to help you relieve everyday stress and anxiety. You can squeeze the ball when you feel nervous, stressed or sad to gently relieve yourself. It is a good way of self-healing without affecting others. . Anti-stress balls-Ecological material: : The product is made of environmentally friendly thermoplastic rubber (TPR). The surface is the durable PU material. High elasticity. No slippage. You can squeeze as hard as you can. . Stress ball size: : Average size of 5.8cmX4.4cm, Weight: 46 grams. Perfect for your hands, neither too big nor too small, fits all family members. . Pressure relief and grip: : the colored ball has three levels of progression (Yellow10lb - Red20lb - Blue30lb) to help you focus and train your hands, forearms and wrists. An excellent aid for therapies targeting stroke victims, carpal tunnel syndrome post-surgery, lateral epicondylitis, perfect for strengthening weak or injured hands as well as wrist and forearm muscles. . Hand finger strength exercise: : This stress ball can not only help you release bad emotions, but also help you practice your hand or finger strengthening, or grip trainer. Anti-stress object: Especially the pianist, guitarist, keyboardist, office worker and people who often work by hand. .