This item is used to keep and peotect items from damage during the process of mailing. Whether you are thinking of mailing documents or something else, these padded sturdy envelopes should be your first choice. These envelopes can be used in offices, at home, and schools. Features - Color: Silver. - Material: PET. - Size: 18 x 15 x 0.5cm/7.08 x 5.9 x 0.2 inch. - Waterproof, shockproof, easy to tell if the envelope is tampered. - Lightweight mailing envelopes, will not add to your shipping cost. - With a self-adhesive seal that makes the envelopes very easy to seal. - Feel nice to the touch and are perfect for handwriting, labeling and stamping. - Can be used in offices, at home, in shops, schools and everywhere where there is a need for shipping.