Biopsy processing cassettes are similar to the slotted cassettes but have a 1 mm square mesh for small biopsies. Made from Acetyl Polymer, which is a special high density polymer that keeps specimens safely submerged in solution, these cassettes are totally resistant to most histological solvents and their slots offer maximum flow through for good fluid exchange and proper drainage. Lids either come attached to the cassette or are packaged separately Lids can be opened and closed as often as necessary and always relock securely without specimen loss Large labeling areas are located on three sides of the cassette for your convenience Each slot measures: 1 x 5 mm, total 128 slots per cassette