Same factory treatment that Factory Race Teams and OEMs receive is now available to all Twin Air customers. Pre-Oiled with Twin Air BIO Foam Filter Oil using state of the art filter oiling machines, which provide ultimate consistency in pore coverage. Same industry leading Twin Air Filter that you are used to; pre-oiled for your convenience. Comes in re-sealable bag for added convenience. Coarse, open-pore foam catches airborne dirt, grime and sand. Fine, open-pore inner foam acts as a second filter to trap the smallest particles while ensuring maximum air passage. Exclusively formulated adhesive withstands repeated cleanings, even with harsh solvents or gasoline. Slightly smaller than stock filters to increase air space around the filter and improve circulation. Fused outer- and inner-elements prevent dirt and grime from being lodged between layers. Thick, flat foam, greaseless sealing ring ensures maximum contact with your air box, while acting as a breathable gasket for increased air passage.