TwinAir - Dual Stage Air Filter (TA150915)From everyday riding to the most adverse conditions nature can dish out, you want engine protection you can count on. The Twin Air line of air filtration products will provide with maximum intake protection day in and day out. 1. Coarse open pore outer foam catches airborne dirt, grime and sand. 2. Fine open pore inner foam acts as a second filter to trap the smallest particles while ensuring maximum air passage. 3. Exclusively formulated adhesive