Llamamia Bundle of 6 Hand Exercise Balls Grip Balls Squeeze Ball / Hand or Wrist Strengthener & Hand Exerciser (Egg Shape and Round Shape of 3 Resistance Levels) 3 egg shaped balls made of silicone,3 round shaped balls made of thermoplastic rubber (TPE).Can be repeatedly compressed without losing its shape. Hand therapy kit great for daily strengthening,Keep your fingers, hands and forearms supple and strong Special design with a textured surface for a perfect fit in your hands with 3 different resistance levels(soft, medium, and firm). Golf training,recovery training.Prevents stiffness,increases flexibility,relieves joint pain,reduces stress and eases muscle tension.Promote blood cycle. Size:egg(1.75inch*2.5inch),round diameter 2inch.