For over 30 years, TM Designworks has been manufacturing innovative and unique products in the motorcycle industry. TMD offers superior protection for weekend riders to Factory Race teams. One piece "Memory Flex" TM Designworks machined plastic housing. "Zero Drag" Powerlip Roller adds speed and accurate tension and is replaceable at low cost. Disperses sand, dirt, and mud through the bottom of chain guide body for smooth performance. All necessary hardware is included. Simple bolt-on without removing chain. Fits stock swingarm alloy mount. Replacement Powerlip Roller Kit-new hardware is available separately. Chain guide and rollers are Patented design # D532,720.