Twin Air Air Filter - Yamaha YZ 125/250 1989/1992 WR 250 1989/1997 WR500 1991/1993Twin Air Filter's design, high quality materials and superior construction deliver unbeatable performance and protection and make Twin Air Filters the hands down choice of more World & National Champions than all other filters combined. FEATURES Coarse open pore foam catches airborne dirt, grime and sand. Thick, flat foam, greaseless sealing ring ensures maximum contact with your airbox, while acting as a breathable gasket for increased air passage.