HIGH-QUALITY HEAVYWEIGHT - made from 80lb card stock that measures 5.5x8.5 inches and 4.25x5.5 inches when folded; its durability, convenient size, smooth finish and 98 brightness white color offers a well-rounded purpose and premium quality of printing needs THICK DURABLE ENVELOPES - comes with A2 white self-adhesive square flap envelopes that are made from 28lb bond square and measures 4 3/8 x 5 3/4 inches each; perfectly fit 4 4/4 x 5 1/2 inches sized cards and also great for carrying greeting cards, invitations and much more INKJET AND LASER PRINTER FRIENDLY - it guaranteed no ink smudges and bleeds and the color image will come out clean, crisp and vibrant; printing with these cardstocks made easy for it has a double-sided matte surface, perfect thickness and packed flat