Acerbis' Chain Guides are the gold standard in drive components and purpose built to give you great wear characteristics and quiet operation. Designed to fit inside your OEM guide housing, Acerbis creates their guides from a proprietary injection molded polyurethane to keep your chain gliding like it's on ice. With Acerbis components on your bike you'll get great protection and plenty of life from your chain and chain guide. Also Fits: Honda CR250R 1999-2004 Honda CRF250R 2004 Honda CRF250X 2004 Honda CRF450R 2002-2004