FOAM AIR FILTERS: 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 of any style of riding or terrain. These filters, used with No-Toil foam filter oil, provide the best air filtration system in the world! (Remember: NO TOIL oil washes clean in water and is 100% biodegradable; dirty water can be thrown down the sink. You do not need to use harmful petrol or kerosene to clean your filter. Fits: Yamaha WR250F 2015-2019 WR450F 2016-2018 YZ250F 2014-2018 YZ250FX 2015-2017 2019 YZ450F 2014-2015 2017 YZ450FX 2016-2018