Send important announcements and invitations in style with unique square envelopes Use for special event invitations, announcements and greeting cards. Peel-and-press seal provides secure closure. Made of 80-lb paper. LUX Square Envelopes, 5 1/2in. x 5 1/2in., Garnet Red, Pack Of 250 is one of many Lined & Invitation Envelopes available through Office Depot. Made by LUX.