These low-profile bowls are 6.3cm tall and 14.1cm wide. The even lines make me think they are a variety of mulberry, but they may be keyaki or leiden or something similar.
There are 180 pieces of each color. The white stones are Mexican clams, with some variety in grade but mostly Moon-grade, and they measure 7.5-7.8mm. The white pieces were cleaned according to our Care Instructions including a soak in h2o2. The black are slate that measure about 8.0-8.3mm thick. It is common for black stones to be slightly thicker than white so that they appear the same size side-by-side on the board.
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Please understand that this is a Vintage product.