Y & z vacuum bag. Filtrete Micro Allergen vacuum bags capture 90% of particles larger than 1 micron in size, including dust mite debris, grass, and ragweed pollen. Fits model series: All Hoover WindTunnel (excluding WindTunnel 2), Savvy, Tempo, Widepath bagged uprights, upright cleaners using Z bags including AutoDrive, Breathe Easy, Caddy Vac, Dimension, DirtFinder, PowerDrive, PowerMAX, and TurboPower 3500, 3700, 4500, 5000, 6000, 7000 uprights.