Bosch Air Filters are designed with a high number of pleats and a high velocity cellulose cured media to combat against outside particles from entering your engine. This media is designed with a filtering efficiency of 98%. The filters are also processed with a high-quality polyurethane seal so there is no loss of filter surface. This particular seal also provides elasticity and sealing performance while protecting against water and heat. Bosch Air Filters work to ensure only the cleanest air for strong engine protection and high-performance.