These are generic micro filtration Vacuum cleaner bags that fit the Advance Nilfisk Carpet Twin upright vacuum cleaners models Carpet Twin 14, and Carpet Twin 18. Each bag is constructed with an inner liner of electrstatically charged material trapping even microscopic particles as small as 1 micron. Each package contains 9 high quality bags per package. Made by Envirocare, these bags are designed to meet or exceed OEM standards. Fits Advance Nilfisk part number 703768.