Acid-free, lignin-free, buffered and archival quality, these Cardmaker's Choice cards are fantastic for everything from general correspondence to making elaborate handcrafted cards. These cards feature a landscape format with the crease along the short side and are smooth and blank on the inside. Details: White 5.5" x 4.25" (A2) card sizeFits 5.75" x 4.38" envelope size 80 lb/216 gsm 50 cardsSmooth and blank on insideLandscape format with crease on the 4.25" side Heavyweight Acid and lignin-free Buffered and archival quality