The limit part is make of soft but highly durability rubber, with builted in steels cores and fastening screw to firmly the cable and improve Designed specifically for 5mm / 6mm diameter fitness equipment cables, widely suitable for most home and gym equipment Suitable for fitness equipment wires, antennas, clotheslines, and are also great replacement accessories for various home fitness cable systems Effectively reduce the during training, protect your equipment, and extend the service of the cable Make of rubber and steels, durability and stable, bringing long terms protections and use to your fitness equipment