These are GoVacuum's own ZVac Brand of Hoover style Y HEPA vacuum cleaner bags. These bags are designed to deliver the highest standard of filtration performance and allow the Hoover Wintunnel vacuums to maintain optimal levels of suction and airflow.Consumers will find that the Hoover Y ZVac HEPA Vacuum Bags match the quality and specifications of their genuine OEM counterparts but retail at a significantly cheaper price.The Hoover Y ZVac HEPA Vacuum Bags capture 99.97% of all fine dust particles, allergens, and potential airborne particles – giving the vacuum bags a HEPA rating. Having this type of high quality filtration will significantly reduce the amount of lung damaging particles in the home.Replaces OEM part numbers: AH10040, 4010801YThe Hoover Y ZVac HEPA Vacuum Bags are engineered to fit the Hoover Windtunnel bagged upright vacuum cleaners.