The tapered sleeve, or friction pad, in the WD Hitch anti-sway housing is made from a highly durable plastic material designed to withstand long-term use. The material provides friction only during turns, which minimizes wear when the vehicle is traveling straight. Based on real-world testing, over 11,000 miles of travel, we have observed no abnormal wear. While actual lifespan can vary depending on usage conditions, the friction pad is engineered to last for many years under typical towing conditions. If it ever wears out, we offer a lifetime warranty and will replace it free of charge.