These are certified 5-layer HEPA-FLO micro-fibre filtration system bags designed to fit the Numatic models of Hetty, Henry, Basil, James, all the 180 series, the 200 series, and the 250 series. The bags are packed flat and have a rigid opening for easy insertion into the vacuum cleaner. When fitting a bag, take care to push the collar down the full length of the bag connector. Each pack contains 5 bags.