Aviditi AB313 Poly Bags on a Roll, 5" x 8", 4 Mil, Clear, 1000 Per Roll These bags are on an industry standard core which makes them compatible with all automatic packing equipment Bags are pre-opened at one end and sealed at the other and perforated for easy tear-off Roll converts from 1" to 3" core Manufactured from 100% virgin film that is FDA and USDA approved