These sqaure invitation envelopes are made out of smooth paper and feature a perfectly square shape. These envelopes have straight flap openings and dependable gum closures to keep items secure as they travel through the mail. Their unique size and shape is certain to stand out to all of their recipients. Use them for small square invitations and greeting cards, gift cards, personal letters, nand more!Details:Available in multiple colors5.5" x 5.5"28 lb. (105 gsm)25 envelopesPaper