Molded from one piece (lid and bottom) polypropylene these slide boxes are able to accommodate either 25 or 100 standard 3x1" (75x25mm) slides. The attached lid is held securely by a closed latch lock. Stacking feet maximize the stability when boxes are stacked up one atop the other. The boxes are unlined and the index number is printed on the bottom. Comes complete with a numbered slide index card. These boxes are available in blue, red or white.