Multi-: these mylar bags are suitable for storing food, coffee, tea, dried food, dried fruit, etc.; Suitable for packing, storing, sampling and sorting. Function: you can use heat sealing machine (not included) to seal from light and oxygen , prevent food being exposed to air, light, odors and moisture, these foil pouch bags can extend the storage time of food. Feature: these foil mylar bags with an aluminum-foil layer can prevent tearing and destroying, puncture resistance, not easy to leakage, to meet your long term dry storage requirements. Easy to use: there is a U shape tear on the side for easy tear, save time to find a knife or scissors, sealable with hot iron, heat sealing a long term protection, these mylar bags can reseal after opening, lasting for a long time. Colour: silver Material: aluminum foil Package Contents: 10 * 12x17cm aluminum foil bags 10 * 16x23cm aluminum foil bags 5 * 20x30cm aluminum foil bags Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.