Paper Accents Envelopes are acid-free, lignin-free, buffered and archival quality. These envelopes are made with heavyweight 80 lb. text weight paper for a professional look and feel. They fit A2 cards as well as cards measuring up to 4.25" x 5.5".Details:Available in assorted colors 4.38" x 5.75" envelope sizeFits A2 and 4.25" x 5.5" cards80 lb/118 gsm25 envelopesAcid and lignin free Archival qualityPaper