3″ x 8″ – 4 Mil Poly Bags on a Roll. These bags are on an industry standard core which makes them compatible with all automatic packing equipment. Roll converts from 1″ to 3″ core. Bags are pre-opened at one end and sealed at the other. Perforated for easy tear-off. Manufactured from 100% virgin film. FDA and USDA approved. Close bags with Impulse Sealers.