aFe MagnumFLOW Air Filters PG7 A/F 4in F x 6in B x 4-1/2 T x 8-1/2 HaFe MagnumFLOW Air Filters PG7 A F 4in F x 6in B x 4 1 2 T x 8 1 2 H 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 severe duty environments. Washable and reusable for multiple cleanings, the tall open evenly spaced pleats provide excellent dust holding