These self adhesive card board #10 envelope mailers provide an easy and convenient was to ship your coins or other small items. Each mailer measures 7 3/4x 8 5/8 inches and folds in half to fit comfortably within a standard #10 mailing envelope. The board is made of a cushioned fluted corrugated acts as a pillow for the contents. Sturdy adhesive is strong enough to keep the mailer closed but won't stick to contents, but can be reopened if needed. Package of 20. Coins not included.