Chain Slider. Polisport chain sliders are perfect replicas of the O.E.M. stock parts, produced in TPU (Thermoplastic PolyUrethane) to better withstand the friction and abrasion from your bike's chain. These chain sliders are produced to be durable and to perfectly fit your dirt bike. Injection-molded, quality plastic components with a perfect O.E.M. type fit. Exact replica of stock O.E.M. plastic components but stronger. Inexpensive alternative to O.E.M. replacement parts. Stock color match. Resistant to impact and abrasion. Produced in TPU (thermoplastic polyurethane). Tougher than stock sliders. Packaged in a printed plastic bag.