Hand Therapy Balls - 6pcs Set for Hand Strengthening & Finger Exercise - Soft, Medium, Firm Grip Balls in Small & Large Sizes - Physical Therapy & Stress Relief - Perfect for Office, Home & Rehabilitation Use

The egg shape, sizes and variety of firmness of the balls make these very useful for many different finger and wrist strengthening exercises. The more firm ones also are good for just general strengthening. These are helping with both strength and dexterity after my thumb joint replacement.