Each package includes nine (3 of each design) black and white notecards and nine plain white envelopes packaged in resealable crystal clear plastic bags. Notecards and envelopes are made from non-yellowing acid-free recycled stock. On the back of each card are interesting facts about the subject pictured on the front. All cards are blank inside. Closed cards measure 5.5” x 4.25”. The blank area inside an opened card measures 5.5” x 8.5”.