Two-piece design with a separate lid and square 0.9 mm pores. Made from acetal polymer specifically validated for the Pi Smart Cassette Printer. Pi Cassettes feature four raised pips in the corners of each print face to protect printed surface during dewaxing, while enabling the surface to be cleared of wax. Lids separate. Threaded, 9 colors, 2,000 per case. Compatible with the Pi Smart Thermal Transfer Cassette Printer.