JAM Paper Dark Base Dark Red A7 Invitation Envelopes measure 5.25 x 7.25 inches in size, making them ideal for standard sized 5 x7 invitations and greeting cards! These envelopes are made out of 28lb, high quality, acid free, archival paper. A total of 250 envelopes is included in this pack. Each one features a wide, rectangular straight flap with a dependable, moisture activated gum closure. The dark, rich, bold, and refined red color gives these envelopes an elegant appearance that will stand out and make an impression on all of your mail recipients! Use these envelopes for invitations to weddings and other special events, holiday cards, and much more!