Come and see our amazing products. The material is high quality ABS plastic, Rubber, and Stainless Steel. The size is 5.9 " x 4.3 " x 0.9 ". It is used to increase finger, hand and forearm strength and stamina, using a grip strengthener helps relieve stress. Rehabilitate and relieve pain using the hand strengthener, for conditions such as: Arthritis, carpal tunnel syndrome, tendonitis, rheumatoid arthritis. It allows you to exercise all 4 major grip training types (crushing, pinching, supporting and extending) with these grippers. People have seen great results using these only 2-3 times per week. Customized logo is welcomed. A great idea for promotion gift. Pls confirm with us about the packing info, stock color and exact production time before placing your order