The mylar bags feature a sealing strip zipper closure to keep water, moisture, dust, and odors out when sealed. The sealing strip is reliable, ensuring you always know when the bag is properly closed. These smell-proof bags are made of mylar and foil material, helping food stay fresher longer compared to regular zipper closure bags. Mylar bags are ideal for packing, storing, sampling, and sorting. These resealable bags are suitable for coffee, beans, sugar, rice, baking ingredients, cookies, tea, nuts, dried fruit, dried flowers, medicine, herbs, spices, and many other foods or dry goods. The mylar bags are heat-sealable, featuring a double-sided black design. They are compatible with heat sealer machines for added protection. Size: 7 x 10 cm Material: Aluminum foil Color: Black Package Contents: 100 x Flat food bags Note: Light and display differences may cause slight variations in color. Measurement may vary by +/- 1-3 cm.