The envelopes are made of kraft paper, thick and durable with excellent sealing performance. Your privacy will be well protected. Customize or mark your envelopes with your own ideas, stamp, ink, print and write on them to ensure that they are unique. Envelopes 4x2.7in (10.16x7cm). Pocket-sized envelopes are all right with carrying and storing small parts. These envelopes do not require additional stickers or tape, just a little water to slightly wet the seal, fold and press the flap for 30 seconds to ensure the envelope stays sealed. Ideal for holding a variety of small items such as gift cards, business cards, small note cards, coins, keys, buttons, pins, seeds, etc. They are perfect for any occasion, including holidays, Christmas, weddings, birthdays, and parties. 10 Pack 4" x 2.75" Mini Gift Card Envelopes, Small Envelopes for Holidays, Weddings, Birthdays Banquets - Black