Disposable tissue processing cassettes assist with the routine processing, embedding, or sectioning of biological tissue. Available in deep well or longer chamber designs, the securely locking container can accommodate any specimen. Precision molded for histological solvent resistance, the various colored cassettes keep samples submerged until ready. Different pore size options allow tailoring of ventilation to allow fluids to flow through and rapid draining. Multiple frosted areas for identifying labels ensure accurate testing.