This Eaton SENTINEL filter bag is designed to be durable, with a bypass-free construction. Bag PEMU-100-P01Z-50 is a size 01, 100 micron polyester multifilament filter. The SENTINEL ring is made of Santoprene, an elastomer that creates a strong seal between the bag and housing. The SENTINEL is unique in that it is all welded, not sewn. The bag ring snaps into Eaton filter housings, holding the bag in place till the lid is closed. This bag also includes handles for easy removal from the housing.