Individually, self-contained, stackable drawers. They hold approximately 250 Histo-cassettes or embedding rings. Supplied in economical two-drawer packages with interlocking ridges on the top and the bottom for easy stacking of as many cabinets as you want. Each drawer is encased in a rugged, high impact plastic sleeve, so your cassettes are completely enclosed and protected. They come with color decals which allow you to organize each by function. Cassettes are not included.