Molded from a special high density polymer, these cassettes keep specimens safely submerged in liquid and are totally resistant to the chemical action of most of histological solvents. The MICROMESH™ mesh ensures efficient fluid exchange and drainage. The one-piece integral lid eliminates the need for separate steel lids. They can be opened and closed and always relock securely without danger of specimen loss. Anterior writing area is at a 45 degree angle.