These K&N air filters are an exact fit for your Royal Enfield 650 Twin. Perfect for those individuals who want to remove the stock airbox, and add improve the aesthetics of the engine area. 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 cotton gauze material, it can be cleaned and reused repeatedly. Sold as a pair.