You are purchasing 4 genuine Riso brand S-8140 masters. For use in Risograph RZ990, RZ1090, ME9**, SE9**, MZ10**, MZ9**, RZ10**, and RZ9** digital duplicators.
The old Riso part #s wereS-6872,S-2632 and S-5467.
This product has been recently manufactured, this is not old inventory.
Please feel free to email me any questions about compatibility, etc. We pack the product boxes in another box to protect them during shipping. Thanks for looking at our listing.