Unique square envelopes create an eye-catching presentation for invitations and announcements Use these square envelopes for sending unique greeting cards, invitations and special announcements. Made of 80-lb paper. Peel-and-press seal provides secure closure. LUX Square Envelopes, 7 1/2in. x 7 1/2in., Garnet Red, Pack Of 250 is one of many Lined & Invitation Envelopes available through Office Depot. Made by LUX.