Set of (4) Heavier Iron Ball with Chime , Stress Relief Hand Exercise (Finger Therapy Good for after using Hand Grip or Squeeze ball) While rolling on your hand it can help to relief your stiffness and relax your entire hand just like a finger THERAPY The manufacturer doesn't make this item any more because the balls are heavier and cost more. The ball is 1 3/4" diameter 5 oz Reliefs your muscle and joint all together. Hold 2 with 1 hand and rotate in your palm! This set comes with 4 balls for your right and left hand.Case color might be different!