Two-piece design with a separate lid and square 0.38 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 PiSmart Thermal Transfer Cassette Printer. The new and improved cassettes now incorporate a smoother print face, resulting in improved print of barcodes and text. This improvement also means you can use a much lower print heat setting between 3 and 5 while still achieving the highest quality print result.