Hand Strengthener Set~Hand Grip+X Men Magneto Iron Balls Wrist Builder Stress Relief Hand Therapy US Seller Set of 2 ~ 1 hand grip + 1 set X Man Magneto iron ball (case color may be vary) Size: 5"(L) X 3.75"(W) ~ Hand grip 2" (Diameter) each ~ Iron ball Left & right brain exercise good for kid and adult! Too much typing or clicking on the mouse makes your finger STRESSED? An exercise for brain and hand when you play both hand grip and iron balls together.... YOU WILL GET WHAT I MEAN WHEN YOU PLAY TOGETHER... This is not a toy!