The SNAP-RING filter bag is Eaton's most economical choice yet. Despite its high standards of performance and filtration quality, this bag has a very low price. Made under ISO 9001 standards, these affordable filter bags will always serve their purpose in providing superior filtration. This product is made of Polypropylene Felt and has a Polypropylene Snap Ring. It is a size 4 and has a Micron Rating of 200. Sold in box quantities of 50.