Fashioned from high quality 28 lb. paper, JAM Paper A1 Invitation Envelopes are the perfect envelope option to get recipients' attention. These envelopes are perfect for sending a variety of content, both business mailings and personal mailings. Use to mail graduation party invitations, holiday greetings, announcements, photos, thank you cards, business correspondence and more!Details:Available in assorted colorsA1 size (3.625" x 5.125")28 lb. paper50 envelopesStraight flap, gum closure