These combination packs include 500 self-adhesive, deep, low back book pockets plus 500 2-column grid date due book cards. The cards are medium weight and are made from 27 percent recycled index card stock. Lines for author and title are printed above the grid. The pockets are self-adhesive and made from high grade #77 pale cream, acid-free, high-fiber content paper. Both the pockets and cards resist wearing, fraying and tearing. Book pockets measure 4 1/2 inches H by 3 1/2 inches W and hold a standard 3 by 5 inch card.