EnviroCare 1/2 Case (25 Pkgs) Eureka Sanitaire Ultra/Electrolux Z Upright Vacuum Cleaner Bags Designed to fit original manufacture OEM numbers 52339, 52339A, E52339, 52339-12, 45055, and 302927. Will fit these models and more: Eureka 7400, 7500, 7534A, 7575, 7522B, 7528B, 7529A, 7545A, 7575D, 7577B, 7577D, 7534A; Sears Ultra Z; some models of Sanitaire. Traps and seals in 99.7% of dust mites, pollens, ragweed, mold spurs, microscopic particles, bacteria, dust mites, germs as small as 0.1 micron, other allergy causing agents, and 99.9% of pet dander. A must for allergy sufferers!