Made of flame-laminated dual-layer foam bonded with the highest quality glue to stand up to the roughest and toughest of any style of riding or terrain, These filters, used with No Toil foam filter treatment, provide the best air filtration system in the world, Fully open-cell structure for highest airflow and maximum protection, Heavy-duty glue provides protection from all solvents, Wide soft sealing ring for extra protection, Flexible seams prevent cracking, Original OEM sizes, Made in the U.S.A.