aFe MagnumFLOW Air Filters PDS Clamp On A/F 3-1/2F x 5B x 3-1/2T (Inv) x 8HaFe MagnumFLOW Air Filters PDS Clamp On A F 3 1 2F x 5B x 3 1 2T (Inv) x 8H With three layers of progressively finer mesh synthetic media between 100% polyurethane top and base, this high flow, "oil free" conical performance filter provides maximum convenience and easy maintenance with excellent airflow. Washable and reusable for multiple cleanings, the tall open evenly spaced pleats provide excellent dust holding capacity for longer service cycle