For a time-tested, reliable, and affordable filter bag to suit your needs try the Eaton SNAP-RING. Bag PO-25-P03O-50 is a size 03 Polypropylene filter bag that is 25 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. This line of filter bags is available in 14 different materials, micron ratings and ring types. This bag model comes in box quantities of 50.