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 handmake 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! Note: 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. No Toil oil is 100% waterproof - until water is mixed with No Toil cleaning crystals. Fits: Honda CRF250R 2015-2017 CRF450R 2014-2016