The Arlen Ness High-Flow air filter element is made using the finest materials available. Each filter is pre-oiled, and feature four layers of surgical-grade cotton to promote airflow and filter air effectively. It is hand-poured one at a time in a urethane body, unlike many other filters that are spun, which can leave a residue on the filtration media. The Stainless Filter differs from the Standard Filter in two areas: The mesh supporting the gauze is made of a rust-resistant stainless steel as opposed to standard carbon steel, and the cotton filtration gauze is in its natural white color, rather then the shade of red of the Standard Filter.