Industry standard core makes these bags 100% compatible with all automatic packaging equipment. • Bags are pre-opened at one end for easy insertion and pre-sealed at the other end. • Precise perforations for proper bag performance with automated equipmeent and allow for easy tear-off. • Work excellently in manual applications too. • Bags are from seamless tubing and bottom sealed for extra strength, with no side seals. • Close bags with twist ties or heat seal with impulse sealers. • Roll converts from 1" to 3" core. • 100% virgin polyethylene, FDA and USDA approved.