Contains: (1), (2) or (3) Premium 8"x16 Feet or 11"x16 Feet SteelPak Textured Mylar Vacuum Seal Food Storage Rolls Features and UsagesOur patented design is the only Mylar aluminum foil rolls that may be used in all major vacuum sealers (as well as other similar vacuum sealers that use rolls) without the need for an attachment or snorkel, allowing you to create custom-sized vacuum seal Mylar food storage bags!.Our first-of-their-kind patent-pending SteelPak Vacuum Seal Rolls combine the benefits of vacuum sealing with the protection of Mylar. SteelPak bags are scientifically proven (see attached MOCON testing data) to be 4500% more effective at blocking oxygen penetration than clear poly/plastic vacuum bags sold by our competitors. SteelPak vacuum rolls/bags have an exclusive textured surface, similar to FoodSaver vacuum rolls/bags, that allow air to be removed during the vacuum cycle. Our Mylar films have extremely low Oxygen Transmission Rates (OTR) and Moisture Transmission rates (MVTR). 4.0 Mylar provides excellent and leak proof performance barrier from air, moisture,, vapor, odor and light intrusion. The ShieldPro Platinum Guarantee ShieldPro is committed to your success, and offers a full money-back guarantee on any product, for any reason. If you have questions, you are welcome to reach out to our food storage experts, and we also include links to online information and frequently asked questions to help you understand the process.