Each package includes eight black and white notecards and eight 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”.