Usabestdeal&reg; Massage Ball Rehabilitation Wrist Finger Recovery Training -Egg Silicone Grips or Hand Exerciser-three Setsred, Green and Blue) - Take it out when your hand are free, which could exercise your hand and enjoy yourself. -Strongly recommend to old man and children more than 4 years old to exercise they tactile sense. -Make of high elastic silicone material which gives people good sense of touch -Keeps the ball in your palms, then Make ten times hand scale exercises, alternate from one hand to another hand. -include three colors ( red, green and blue).