A special blend of fibers and resin creates a proprietary filter media that captures 95%1 of the dirt particles that can cause harmful engine wear. Start-up engine protection is delivered through a precision molded silicone anti drain back valve. The perfect balance of dirt-trapping efficiency and dirt-holding capacity. Sure Grip coating provides a non-slip finish for easier installation and removal. Engineered for conventional and synthetic oil types. Internally lubricated sealing gasket for easier filter removal.