The sharpening wheels are made from bonded synthetic materials. The synthetics used are selected for their ability to guarantee longer wheel life, uniform cutting, and minimum heat built up, so that de-tempering of your blade does not occur. The crossed ceramic rods put the final finished edge on your blade. Crossed ceramic rods create a pre-set sharpening angle that lightly hones both sides of your blade at the same time, thus, putting a polished, razor sharp edge on you knife. Electric and manual sharpening features. Non slip rubber feet.