For 4" x 6" PhotosOur most popular card, the Simplicity collection is now available in 16 stylish solid colors!These are acid-free & archival quality plain paper photo frame style cards. With 16 modern and classic colors, you'll find one perfect for your picture! Larger window opening is 3 ½" x 5 ½" showcasing more of your 4" x 6" image (which means less cropping along the edges). Photo slip in cards require no glue or tape, just slide it into the pocket opening! Simplicity cards are also full color throughout - the front, inside & back is the same continuous color for a premium, professional look. Each greeting card holds a vertical (portrait) or horizontal (landscape) photograph, and comes with a white envelope.