Filtrete 3M Hoover Style Y Micro Allergen Vacuum Bag (Set of 10) 3M Filtrate vacuum bags are guaranteed to be free from defects in material and workmanship Micro Allergen vacuum bags capture 94% of particles larger than 1 micron in size, including dust mite debris, grass and ragweed pollen Replaces Hoover part number 4010100Y Replace bag every 30 to 60 days for optimum performance Fits all Hoover Windtunnel Upright Vacuums