The Sissel Press-Ball is a solid foam ball available in different densities to improve mobility in the fingers and thumb and to increases grip strength and improve dexterity. Included with the Press-Ball is a useful exercise sheet. Press Ball to exercise your hand and forearm....... solid foam ball available in different densities easy to clean and sterilize especially suitable for finger therapy improves the mobility in the fingers and thumb inceases grip strength improves dexterity neurofascia techniques works all muscles in the hand and forearm complete with exercise sheet