Slides smoothly without jamming,finely crafted to withstand high-frequency grip training.One-Piece Solid Alloy Structure:Constructed from heavy-duty alloy steel for excellent wear resistance. Suitable for athletes, weightlifters and daily users, aiding in the recovery from overuse injuries.Product Material: Carbon Steel+NylonProduct size: Handle: 31.5 3.5cm Roll strap: 100cm Extension strap: 50cmThe set includes: Forearm Trainer 1 Extension Band 1.