Pathflow Attached Lid Cassettes are a one piece design with a rear hinge & front tab closure. Available in Slotted and Biopsy. Loose cassettes are 1500 per case. Threaded cassettes come in stacks of 40 cassettes, and 25 stacks per case of 1000. These threaded cassettes can be loaded in printers. The 35 degree print face is designed to be compatible for printing on the Leica IP C Inkjet Cassette Printer, Primera Signature cassette printer & the Tissue-Tek SmartWrite Cassette Printer. They are a suitable replacement for the Unisette(M505 & M506) and Signature cassettes.(M405 & M406).