Are you looking for an envelope that will stand out in quality and overall appearance? These square envelopes are just the thing! These envelopes are made out of high quality, acid free, archival paper and have a perfectly square shape! Each of these envelopes has a rectangular straight flap with a secure gum closure. Use them to send invitations to events, response cards, greeting cards, letters, birthday greetings, and more!Details:Available in multiple colors5.5" x 5.5"28 lb. (105 gsm)25 envelopesAcid free, archivalPaper