Eaton bag description PE-50-P01H-WW-50 details a 50 micron SENTINEL bag made of polyester with a polyester ring. This is a size 01 bag that comes in box quantities of 50 bags per box. Whether your applications is filtration for paints, chemical processing, food and beverage, or another industrial use, the SENTINEL bag is a versitile and heavy-duty option. All bag felts are welded to create a super-strong construction without bypass. SENTINEL bags also feature elevated handles, special sealing rings, and silicone-free felts.