Acid-free, lignin-free, buffered and archival quality, these Cardmaker's Choice envelopes are fantastic for pairing with everything from general correspondence to elaborate handcrafted cards. These envelopes are smooth and blank and made from heavyweight paper. Details: White 4.38" x 5.75" envelope size Fits 4.25" x 5.5" (A2) cards 80 lb/216 gsm 50 envelopes Heavyweight Acid and lignin-free Buffered and archival quality