Arlen Ness Stage Big Sucker / Screamin' Eagle Stage 1 Air Filter For Harley Arlen Ness High-Flow air filter elements are made using the finest materials available. Filters are all pre-oiled, and feature four layers of surgical-grade cotton to promote airflow and filter air effectively. The filters are 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. Features: Replacement filter for Arlen Ness Stage 1 Big Sucker Intakes for Twin Cam / Sportster / Evo Engines Available in the Standard Red or Stainless jacketed black cotton filter material Sold each Note: Not for use with OEM air cleaner covers.