S&B cotton gauze round open air filters. These air filters are washable and reusable performance filters. They are easy to install & maintain, and with proper maintenance will last the life of the vehicle. These gauze air filters mean More Air - More Power. Designed to give you more horse power. S & B filters are tested to ISO 5011 filtration standard. They are designed to stop 99%+ of the dirt and still flows better than the OE paper filter or comparable competitor products. Backed by a Million mile limited warranty. Manufactured in the U.S.A. Tested to a Higher Standard. S&B has spent 30 years on research and development to bring the highest quality filters to market, and our test results demonstrate our success.