Our Vacuum Sealer Rolls are constructed of commerical grade 2 ply nylon materials that are 3.5 mil thick. Works with the Pro 2300 Sealer by Weston and most other Vacuum Sealers including food saver brand. These Vacuum Sealer Rolls and bags are reusable and dishwasher and microwave safe. You can even boil food right in the bag. Hunters and fishermen can eliminate freezer burn and enjoy the fruits of their harvest all year long. Vacuum Sealers, Rolls, and bags are also convenient for many other household uses in addition to food preservation. Compare the quality/quantity/value/price of this Roll to other leading brands. You will not be disappointed.