This is about as small as bowls can come while still holding a full set of standard-width stones. The bowls are a pleasant brown color and you can see my refurbishing progress on Instagram. They were scrubbed, cleaned with turpentine, then treated with a Monkey Wax polish.
The bowls are delicate and light, measuring about 11cm wide and 7cm tall. They could be Nara (oak) or Kuri (chestnut) based on the brown tone, or even old Keyaki (Zelkova) because of how even and consistent the grain of the wood is.
The white stones are Japanese clams, with a wonderful variety in patina from age. I would guess call them Snow-grade for their dense lines, but Suwabute (flower) may be more accurate. The black are slate. There are 180 of each color. The white measure 4-5mm, and the black measure about 4.5-5.5mm thick.
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Please understand that this is a Vintage product.