Tusk Pro Defense Air Filters have been designed to give excellent engine protection while providing more air flow than the competition. High quality fibrous mesh makes up the base of the filtration media, then a custom nano-coated film is applied giving better protection than OEM. Tested at 99.9% efficiency with extremely low resistance. Built with heat resistant silicone end caps to resist size fluctuations and provide a more consistent and safer seal. Bottom line, these air filters provide superior filtration while maintaining maximum airflow even in the worst conditions! This filter mounts and is maintained the same as OEM. Think Tusk for all your motorcycle, ATV, and UTV performance needs! -Must reuse the OEM plastic seal ring.