CBN sharpening stone ALDIM  -  150х12х7х3 мм  
150 мм (5.9 inch) - length,
12 мм (0.5 inch) - width,
7 мм (0.27 inch) - total thickness.
3 мм (0.12 inch) - CBN layer thickness.
4 мм (0.16 inch) - thickness of the aluminum form.
Bond - ВР05 -  metal-organic wear-resistant.
ВР05 bond is similarin wear resistance to metal bond.
Bond  - BP50- metal-organic polishing.
BP50 is distinguished by its softness in operation
and high cleanliness of the sharpened surface.
ALDIM CBN whetstones for sharpening knives on a metal-organic bond are characterized by high wear resistance and durability, while working smoothly and efficiently.
CBN knife sharpening stones outperform diamond, silicon carbide and aluminum oxide stones.
CBN whetstones for sharpening knives maintain their straightness longer, work faster, and are suitable for sharpening all types of steel.
CBN whetstones for sharpening knives can be used with or without oil.
CBN whetstones for sharpening knives will serve you for decades.
CBN Sharpening Stones consists of a 3 mm thick CBN-bearing plate mounted on a high-quality aluminum blank. 
The CBN-bearing plate contains evenly distributed CBN grains with  bond.
I use CBN stones, the knife can be sharpened to a razor sharpness.
 
The stones need to be serviced once a year. Apply a little water and silicon carbide powder to the glass.
 Place a stone on top and move it in various movements. 
The CBN grains will come out of the bunch and the stone will be as good as new.
Comparing CBN and diamond grains, it is clear that CBN grains in the stone work softer, and do not cause unwanted scratches on the cutting edge during processing
This is due to the fact that CBN has an octahedron-shaped crystal structure - there are more cutting edges with less sharp angles -
 this results in softness during processing and wider metal removal
Diamond has a crystal structure in the shape of a tetrahedron, in which there are fewer cutting edges and sharper corners of the crystal,
 which leads to “aggressive” work of the diamond during finishing and further finishing.

Available grit: 2/1; 3/2; 5/3; 7/5; 10/7; 14/10;
20/14; 28/20; 40/28; 50/40; 63/50; 80/63; 100/80; 125/100; 160/125; 200/160/
It is possible to make a set that you like best.
Write.
Grit table:
315/250 – 80 grit
250/200 – 90 grit
200/160 – 100 grit
160/125 – 120 grit
125/100 – 150 grit
100/80 – 200 grit
80/63 – 260 grit
63/50 – 340 grit
50/40 – 400 grit
40/28 – 600  grit
28/20 – 700 grit
20/14 – 1100 grit
14/10 – 1500 grit
10/7 – 2000 grit
7/5 – 3000 grit
5/3 – 4000 grit
3/2 – 6000 grit
2/1 - 8000 grit