DESIGNED TO FIT IN THE FACTORY AIR BOX EXACTLY LIKE ORIGINAL FILTERTHE BEST SELLING REPLACEMENT AIR FILTER FOR COMPETITION MOTORCYCLES AND ATVSUNIQUE TWO STAGE DESIGN ALLOWS FOR EASY AND COMPLETE CLEANINGDUAL LAYER OF FOAM, CAN BE SERVICED SEPARATELYTHIN ULTRA SEAL BASE IS VIRTUALLY IMPOSSIBLE TO TEAR AND HAS A BUILT-IN "GREASE GROOVE"USED BY FACTORY YAMAHA, KAWASAKI AND SUZUKI OFF-ROAD