Part no. RHK-0.1.25 Fitment: Honda CRF250R 2004-2009 Honda CRF250X 2004-2017 Honda CRF450R 2003-2008 Honda CRF450X 2005-2017 "RHK Filters are designed and manufactured to increase airflow whilst ensuring the ultimate level of protection. RHK Filters consist of an outer layer of coarse open-pore foam which catches large dirt, grime and sand particles. The 2nd inner layer of fine open-pore foam aids in catching minute & finer particles whilst delivering maximum air flow."