Cassette Filter, For Vacuum Type Backpack Vacuum, Fits Vacuum Brand Sanitaire, Fits Vacuum Models SC500, Filter Pickup Type Dry, Filtration Type HEPA, Filter Efficiency 99.97 Percent at 3 microns, Filter Material Paper, Filter Reusability Non-Reusable, Height 1 1/8 in, Length 6 1/2 in, Width/Diameter 4 3/4 in