Set of 2 Green Taiji Iron Ball Hand Stress Relief EXERCISE Finger Health Therapy US Seller Set of 2 Green Taiji Iron Balls (case color might be vary). Size: 1 3/4" (Diameter) ~ each Weight: 7 oz ~ per set While rolling on your hand it can help to relief your stiffness and relax your entire hand just like a finger THERAPY Hold 2 with 1 hand and rotate in your palm! Comes with a presentable oriental style case! (case color might be vary).