Disposable plastic cassettes that hold tissue specimens during processing and embedding, as well as in storage. Molded from a special high-density polymer, these patented cassettes keep specimens safely submerged in liquid and are totally resistant to the chemical action of histological solvents. The efficient flow-through slots maximize fluid exchange and ensure proper drainage. The one-piece integral lid eliminates the need for separate steel lids. They can be opened and closed as often as necessary and they always relock securely without danger of specimen loss. Large labeling areas are located on three sides of the cassettes for your convenience. Available in non-cytotoxic, non-metallic colors. Anterior writing area is at a 45° angle to make the cassette more suitable to be used with certain types of automatic cassette labeling instruments.