Similar to a stockbook, these cards generally are available in two sizes (small: about 3" x 5", large: 5" x 7"). Stock cards have horizontal rows of slots into which stamps can be placed. The old type of stock card (still sold and used) are made of manila card stock with pockets that are not transparent. The newer kind of stock card (and the one preferred by most collectors) is made of either black or white card stock ad the slots are made of clear plastic so that, when the stamps are placed into them, the entire surface of all stamps can be easily viewed.