Stainless steel film cutter, from 35mm stock to dual format, 16mm and 9.4mm. So you have the best of both worlds, in case you shoot both formats. If not shooting 16mm, you should; get one of cameras using this format, competing one to one with your own Minox camera. A win-win thing, come to think of it.
Obviously, as you already know, this dual cutter is one of the Jimmy Li's own devices, reviewed here by yours truly. The mechanism and concept and the quality of manufacture is excellent. Together with the dedicated 9.4mm film cutter (4 x 9.4mm strips) and the 8x11 brass cassette, it is one of the must-haves item if you are committed to seriously shoot Minox format.