For a dynamic filter bag that can handle tough industrial jobs, the SENTINEL is an excellent choice. It combines welded construction with a pressure activated ring seal for bypass-free performance. This particular bag model: PEMU-200-P02Z-50, is a 200 micron size 02 filter bag made of polyester multifilament and santoprene (ring). Eaton filter bags must be ordered in box quantities. This bag comes 50 filters per box.