These policy envelopes open on one of the shorter ends and are made out of smooth, high quality paper. Each envelope in this pack features a basic white color. To keep the contents placed inside of them secure as they are being transported through the mail, these envelopes feature straight flaps with reliable, moisture activated gum closures. Use these white policy envelopes to send letters, receipts, invoices, invitations, Save-The-Dates, announcements, paperwork, and more through the mail!Details:White4.5" x 10.375" (#11) size28 lb. (105 gsm)50 envelopesPaper