Designed for use with Tissue-Tek Uni-Cassette and Biopsy, along with Tissue-Tek Processing/Embedding Cassettes. The 5-mm deep molds are made of stainless steel and are reusable. They have extended fins to prevent tipping and to provide a gripping surface for easy handling. The flat, metal bottom allows maximum heat/cold exchange to enhance embedding and releasing the paraffin block.