These pure aluminum foil bags are suitable for long term storage. Perfect for packing shampoo, hair care, lotion and coffee beans, ground coffee, candy, cookie and so on. Suitable for daily packing, storing, sampling and sorting. Feature: Flat, open top, heat sealable, vacuum, with tear notch, keep products dry Need to use a heat sealing machine to seal the bags to keep food fresh and to extend the storage time of food. The thickness is 0.1mm,3.9 mil per side ; 100 pieces each pack This size is very small, please confirm the size before placing an order. 1 inch equal to 2.54 cm ; Outside size 5x7cm (1.97x2.76 inch) Usable size 4x6cm (1.57x2.36 inch) 1. This size is very small, please confirm the size before placing an order. Outside size 5x7cm (1.97x2.76 inch) ; Usable size 4x6cm (1.57x2.36 inch) 2. 100 pieces each pack 3. The color of the bags is silver 4. The thickness is 0.1mm,3.9 mil per side 5. Feature: Open top, vacuum, flat, heat seal, keep products dry, can use the heat sealing sealer to seal the bag 6. Usage: Perfect for coffee, beans, candy, sugar, rice, baking, cookie, snack and more food long term storage Notes: Please confirm the size before you place an order, One inch is equal to approximately 2.54 centimeters