10 PACK OF SILVER THERMAL BUBBLE MAILERS: 7 in x 11.5 in - Our bubble mailers are 3/16 inch thick and made of thermal radiant foil with poly bubble liner. The foil reflects 96% and 4% emissive. This combination helps hold the temperature inside for sensitive items and cushions during shipment.FOOD SAFE MATERIALS, KEEPS COOL or WARM: Thermal bubble mailer material and adhesive is food grade safe for safely packaging, transporting or holding foods. Helps temperature sensitive items stay warm or cool during transport.EASY PEAL & SECURELY SEALS: Each insulated bubble mailer has a food grade self-sealing, easy-to peal adhesive strip to secure and protect your item while providing a thermal insulation barrier.PREVENTS HEAT DAMAGE: Use EcoFoil's heat resistant bubble mailers to mail perishable foods (cheese, meats, chocolate, etc.), pharmaceuticals, or other items that are temperature sensitive and require heat protection.DURABLE & LIGHTWEIGHT: EcoFoil's poly bubble mailers are made of reflective metalized foil that measures 3/16 inch thick to protect items during shipping. Items should be bubble mailers should be shipped inside a durable self-mailer or box to prevent tearing of the radiant material.