aFe Filters 72-40035 Universal Clamp On Air Filter with Pro-GUARD 7 Media 2 Year Limited Warranty 7 Layers Of Cotton/Synthetic Media Maximum Filtration Progressive Bump Seal For Leak Free Seal Requires aFe Restore Kits To Recharge Filter Improves airflow for better performance and acceleration Pre-oiled, washable/reuseable air filter for long service life with life-time warranty Patented Pro-GUARD 7 Five-Layer Progressively finer mesh cotton media with Two-layer Progressively finer porosity synthetic media for highest filtration efficiency for extreme dust environments. Tall, Rounded, evenly-spaced pleats for maximum dust holding capacity Constructed with 100% pliable polyurethane for great seal without the use of foam gaskets or sealing grease.