These are lidded cassettes designed to be used for large tissue pieces in the Tissue Tracking process. PatoSLim Super Mega Cassette can be used for large tissue pieces. There is a compartment that allows 2 different large pieces of the same patient to be placed in the cassette. Patient and part information can be written in the writing area on the front of the cassette. Cassettes are resistant to high temperatures. There are 3 different Main Color options.