The SENTINEL line of filter bags by Eaton was designed for bypass-free construction. It features all welded bag seams and a pressure sealing ring that make for an effective and efficient filter bag. This particular bag has description, NMO-800-P02E-50, denoting a size 02, 800 micron filter. SENTINEL bags are made without sewing. Instead, the chemically resistant felt is welded to create strong, bypass-free seams. Made of Nylon monofilament with a Polypropylene SENTINEL ring, this bag comes in box quantities of 50.