Metal training ring helps you to strengthen your wrist, forearm, upper arm and shoulder. It is good for tiger claw, eagle claw, dragon style or any other styles to do with claw. This ring moves up and down, rolling in your forearm when you are punching, blocking, it makes your whole forearm bone harder and stronger. There are two sizes for you to choose. small size inside diameter is 3 inches, the weight is 1.25 Lb each ring. Medium size inside diameter is 3.5 inches, the weight is 1.40 Lbs each ring.                    Sold by set of 10 rings.