For a time-tested, reliable, and affordable filter bag to suit your needs try the Eaton SNAP-RING. SNAP-RING bag PO-1-P04O-50 is size 04, 1 micron. This filter bag features a Polypropylene plastic SNAP-RING attached to the top of the bag. Silicone free, and made of top-notch materials, SNAP-RING bags are also manufactured under ISO 9001 quality standards. SNAP-RING bags come in a wide range of materials, ring types and micron ratings for a bag tailored to your application. This bag comes 50 per box. Box quantities required on all Eaton filter bag orders