Eaton's SNAP-RING filter bags may be inexpensive, but they are not cheap! These economical filter bags are made under ISO 9001 standars, so you know they will stand up to the demands of industrial use. This product is made of Polyester Multifilament and features a Carbon Steel Snap Ring. Though available in any specification you may want, this specific product is size 3 and has a Micron Rating of 150ï¾ . Sold in box quantities of 50ï¾ .