These envelopes are made out of smooth, high quality paper. Featuring a basic and versatile brown kraft color, these envelopes are ideal of a wide variety of personal and business mailing purposes! Their size makes them perfect for three-times-folded standard sized sheets of paper. Use them to easily send documents and letters from your home or office! Each one features a commercial flap opening and a reliable gum closure to keep the items placed inside secure as they make their way through the mail.Details:Available in multiple countsBrown kraft manila4.5" x 10.375" (#11) size28 lb. (105 gsm)Recycled paper