Product Name: Miracle Grip 40S (Set of 2) Manufacturer: White Sands Size: Diameter 4cm x Length 12cm Material: Cover: 100% Polyester Core: 100% Polyethylene Product Description: Developed to address contractures of the hands, arms, knees, and legs caused by conditions such as cerebral infarction. The three-dimensional mesh cushion with moderate resilience supports extensor muscles. The box is a little dirty. I only tried gripping it briefly and then put it away. Instruction manual is also included! Thank you.