With seven layers of progressively finer mesh cotton gauze/synthetic media between 100-percent polyurethane top and base, this high flow "oiled" conical performance filter provide maximum protection with highest cumulative filtration efficiency for se vere duty environments. Washable and reusable for multiple cleanings, the tall open evenly spaced pleats provide excellent dust holding capacity for longer service cycle between cleanings. Integrated urethane bump seal insures tight, no leak seal over the life of the filter.