K&N AIR FILTERS. Ideal for extended use in dirty and dusty off-road riding and provides clean carburetion even at high altitudes. K&N replacement air filters are washable and reusable and provide high air flow with excellent filtration.Additonal Fitment:2004-2006 YAMAHA 400 YFM400 Big Bear 4x42005-2006 YAMAHA 250 YFM250 Bruin2007-2009 YAMAHA 400 YFM400 Big Bear IRS 4x41999-2004 YAMAHA 250 YFM250 Bear Tracker2007-2009 YAMAHA 250 YFM250 Big Bear2000-2004 YAMAHA 400 YFM400 Big Bear