Mini Balls are perfectly suited for therapeutic self-massage and strengthening exercises, especially of the hands and feet. Build grip or finger strength and improve dexterity after an injury. Develop motor skills. Perform self-massage to relieve tension, rehydrate and mobilize connective tissue and soften scar tissue. Resilient vinyl construction. 40mm (1½”) dia. Sold in pairs. Mini Balls are the perfect size for hand therapy!