No Toil Foam Air Filter 140-40 Made of flame-laminated dual-layer foam bonded with the highest quality glue to stand up to the roughest and toughest riding or terrain Fully open-cell structure for highest airflow and maximum protection These filters, used with No-Toil foam filter treatment, provide the best air filtration system in the world Heavy-duty glue provides protection from all solvents Wide soft sealing ring for extra protection