4: Ergonomic design, comfortable grip, not easy to slip; Ps:Improved the problem of instability of the suction cup, softer than before, more suitable for adults 1: Food grade silicone, environmentally friendly, soft and safe; 3: Multiple functions, can be used to exercise fingers, palms, wrists, arms, etc.; for hand rehabilitation training, promote blood circulation in the arm and wrist, strengthen the muscles of the hand and arm, and prevent rheumatism and joint discomfort in the arm. 2: Color design, fashionable and novel;