EM 118 Tissue Processing/Embedding Cassettes provided by STE-Mart are made of P.O.M material with 100% resistantance to chemical action of histological solvents. Two-piece design provides simple inserting and fixing to lock the lid into the cassette securely, allows more frequent opening & closing of the lid, and easy & safe removal and inserting of lid from and into the cassette without any danger of specimen loss.