Filtrete vacuum filters help capture dust mites, grass, and ragweed pollen. Fits models Hoover self-propelled WindTunnel uprights. 2 filters per package. No. 64804A-4: Size: 11-3/4" H, Type: Hoover SP WT, Filter Efficiency: Allergen, For Use With: Self Propelled WindTunnel Upright, Pkg Qty: 2, Package Type: Clamshell