synthetic with the addition of natural materials
These grinding stones are a combination of a certain amount of the best synthetic and natural materials. Thanks to several years of hard work and research by a Japanese craftsman named MORIHEI, these natural-synthetic stones with the best cutting properties have been created. Natural-synthetic water grinding stones are available in coarse grits of 1000, 4000, 6000 and 12000 - each of which is baked at a different and significantly lower temperature than conventional synthetic grinding stones. Resin is used as a bonding agent, as opposed to synthetic grinding stones, where mostly magnesium is used.
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