NO TOIL manufactures the world's best 2-stage foam air filters. Using only the best flame-laminated dual-layer foam bonded with the highest quality glue they hand make each foam filter to stand up to the roughest and toughest riding or terrain. NO TOIL filters can be used with NO TOIL biodegradable clean in water cleaner providing the best air filtration system in the world. Fits: Yamaha YFM250 BIG BEAR (SEMI AUTO) 4WD 2007-2009 YFM400 BIG BEAR 2X4 2000-2004 YFM400FW BIG BEAR (SEMI AUTO) 4WD 2007-2012 YFM400FW BIG BEAR 4WD 2002-2006