Resistive Foam Blocks Variety Pack are exercise blocks to help strengthen fingers and hands. Made of slow-recovery foam – the rate of exercise is determined by the foam’s recovery time to help keep the overly enthusiastic patient from over using muscles. In three resistances for different strength levels and to allow progression. Blocks are 4.4×4.4×7.6cm. Wash in warm water with mild soap and air dry. Pack of 12 blocks (3 of each colour).