Spyderco Tri-Angle Sharpmaker with two sets of Alumina Ceramic stones.
One set of of medium grit (dark) for aggressive sharpening and a set of fine stones (white) for professional grade finishing. There is also a set of brass safety rods to protect the user's hand during sharpening.
This is simple and easy to use, but a very efficient knife sharpener. Complete with compact case. The sharpener is listed as used but is in mint condition. £55 posted