For a time-tested, reliable, and affordable filter bag to suit your needs try the Eaton SNAP-RING. Eaton description PO-1-P03O-50 is for a size 03 bag that is 1 micron. Sewn into the top of the bag is a Polypropylene SNAP RING that creates a seal. 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. Box quantities required. Comes 50 bags per box.