Eureka RR HEPA, 2 Bags The media in these bags help trap 99.97-percent of all airborne pollutants 0.3 microns or larger, including mold spores, pet dander, grass and ragweed pollen and other microscopic allergens. Filtrete filtration media contains electrostatically charged fibers that work like magnets Change bag every 30 to 60 days for optimum performance All vacuum brand and model names are registered trademarks of vacuum manufacturers Measures 1-1/5 by 7-1/5 by 10-2/3 inches