Japanese Natural Whetstone Shobudani Shirotoyama Aisa 270g selected by the Yamamoto family for razors
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Shobudani Shirotoyama Aisa from the Umegahata district. Sold by Nakakatsu. The Yamamoto stamp 山本男系山主精選 is especially valuable. It confirms the hand-selected stone was made by the Yamamoto family, historically associated with the development of the Umegahata mines.
菖蒲谷 (Shōbudani Mine).
白砥山 (Shiroto-yama) — "White Stone" layer/section.
あいさ(Aisa) — a type of layer.
Size: 135×69×15 mm, 270 g, hardness 4.8–5; 8000–12000 JIS
About the Stone -
Aisa (あいさ) is an old trade name for a specific texture and layer. These stones are typically medium to hard; they produce a very clean suspension; they work well on carpentry tools; they are suitable for knives; good examples like this one are also suitable for razors.
gray-beige; very dense, uniform structure; virtually no foreign inclusions.
Provides a very clean, mirror-like finish.
A very dense finishing stone with a high probability of a mirror-like finish.















