The T.M. DESIGNWORKS POWERLIPTM chain guide roller is extuded from a special plastic for low friction and long life. We engineer each roller to improve drive chain speed and tension accuracy over stock and cheap universal replacement rollers. Why spend all that money on hop up and suspension parts when a simple roller can add or subtract power and handling. Our trademarked & copyrighted roller is race tested and custom sized for every model Dirt Bike. Each roller comes with ABEC rated and certified sealed racing bearings and most kits include stainless steel washers to protect-reinforce the dust seal and new OEM hardware.