This is the disposable paper vacuum bags for the Windsor Flexamatic commercial upright vacuum cleaner & floor polisher. These bags are multi-ply paper, with an electrostatically charged inner line to prevent any leakage of dust mites, pollen, pet dander, or other airborne allergens.Fits Windsor Flexamatic models FM16, and FM18. Windsor Part Number WI-7022, or 7022 WI. Windsor Product Code 8618442