This bags MADE IN USA has 4 mil-thickness material is designed to be used on virtually all vacuum sealing machines. They are FDA approved, BPA free. Can be resealed and reused Freezable-Reusable-Boilable-Dishwasher Safe-Microwave Safe Excellent for freezing fish, meats and many other items. This rolls material will seal out freezer burn and extend the life of most foods in the freezer as well as the refrigerator or even dry storage.