A strigel is used to maintain and create the absolute sharpness of the knife's edge. The strigel is easy to use and if it is used after each time the knife is used, the sharpness will be maintained for longer and you won't have to sharpen the knife as often with other coarse sharpening tools such as the diamond sharpener.
To use the strigel, place the knife's edge against the leather and pull the knife in the direction of the knife's spine (away from the edge). Repeat the procedure about 20 times on each side.
One side has a rougher surface and the other a finer one. On the coarser side, you can apply abrasive paste if you want to increase the sharpening effect.
Casström stools are handmade from Italian vegetable-tanned 3.5 mm thick leather and have a core of European waxed oak.