The Uni Air Filter is two layers of foam that will trap small and large particles like dust and dirt helping prevent anything reaching to the cylinder. Uni Air Filter is produced of high performance foam and biodegradable. The Uni Air Filter has a seamless design that allows for a maximum amount of air flow to your machine. The Uni Air Filter is easy to clean with the Uni Air Filter Cleaning Kit and will help cut the grease and oils down so you are able to reuse indefinitely. Also Fits: Honda CRF100F 2004-2009 Honda CRF100F 2011-2013 Honda CRF80F 2004-2009 Honda CRF80F 2011-2013 Honda XR100R 1988-2003 Honda XR80 1988-1989 Honda XR80R 1990-2003