Pro GUARD7 performance air filter represents the next generation of performance filtration. The Pro GUARD7 air filter is constructed of pliable urethane with a bump seal for a leak free seal. The filter media is constructed of 7-layers, 5-layers of progressive cotton gauze and 2-layers of synthetic dry media for maximum filtration. This filter is built to endure the most extreme conditions. (US PAT 06811588)