This K&N crankcase vent filter is an exact fit for the crankcase of your Royal Enfield 650 Twin. Perfect for those individuals who want to add some aesthetics to their engine. It has a K&N embossed chrome-plated steel top with a black rubber base. Designed to push in and clamp directly on to crankcase vent. Constructed with a synthetic filter media it can be cleaned and reused repeatedly.