This Eaton DURAGAF filter bag is made of long-lasting needled Polyester felt, which lasts 2-5 times longer than standard felt. This bag's welded seams mean that bypass through pinholes will never be an issue. The Polyester SENTINEL seal ring is durable, effective, and compliant with FDA food contact requirements. This product is size 1 and has a Micron Rating of 1. Sold in box quantities of 30.