Heavy Duty: 3.5 mil thick smooth side for optimum clarity, 4 mil embossed side with dot air channel design for maximum oxygen removal. Puncture prevention design to prevent food from puncturing the vacuum sealer bags. Safety Material: Made from food grade high-density nylon PE without BPA guards your health. Withstand environment from -40℉ to 230℉ with boiling, freezing and microwaving safe design. Perfect for sous vide cooking, marinating, freezing, storing and kitchen organization. Universal Design: Compatible with All 'Clamp Style' Vacuum Sealers with vacuum grooves, such as FoodSaver, Weston, Nesco etc. Note: Not work with Nozzle-type vacuum sealer like our MAGIC SEAL MS175 sealers. Prolong Shelf Life 3-6 Times: MAGIC SEAL vacuum bag has good air tightness, keep food's moisture and flavor in, prevent oxygen from seeping back in and eliminate freezer burn and dehydration to prolong food shelf life 3-6 times. Economic & Convenient: Packed in rolls, easily creating your own length of bags to vacuum and seal any food, reduce waste and save money. Food Grade & BPA Free: Made of high-density nylon PE, safe for storing food. No peculiar smell, non-toxic and durable, thick and not easy to break. Multipurpose Use: Our vacuum sealer bags can be used in sous vide cooking, marinating, freezing, storing, kitchen organization, and travel. Perfect for sous vide cooking, marinating, freezing, storing, kitchen organization, and travel. Leakproof and Durable: The textured bag is made of high-density nylon PE material, which is puncture-resistant and durable.