Eaton's SNAP-RING filter bags may be inexpensive, but they are not cheap! These economical filter bags are made under ISO 9001 standards, so you know they will stand up to the demands of industrial use. This product is made of Polyester Felt and features a Stainless Steel Snap Ring. Though available in any specification you may want, this specific product is size 1 and has a Micron Rating of 75. Sold in box quantities of 50.