For HOOVER Wind Tunnel windtunnel (Type Y 40 BAGS) Fits Hoover upright vacuums that use bags "Type Y". Anti-Bacterial, Capture Microscopic Particles, Germs and Bacteria as small as 0.1 Micron. Provide 99.7% filtration. Micro-lined vacuum bags are ideal for those who suffer from dust related or allergic discomforts. Made in USA!