2 Mil (50 Microns) Poly mailers, in size 9″wide x 12″ high + 1.5″ sealable Flap. Ideal for light to medium weight, small items such as documents, books, cards, small size catalogs and printed materials, accessories, small size clothing, etc. Self Seal Mechanism, water, and puncture resistance. With tamper-evident seals, you can remain worry-free and your packages arrive safely untouched by unauthorized hands. They are made of high-quality polyethylene that protects them from wear and tear while in transit. They are greyish white on the outside and grey on the inside providing opacity which ensures privacy during transportation.