It is a large bivalve shellfish found in the southern seas.
CITES currently prohibits it, but this item was collected before the Convention was imposed.
This Go Stones has the beauty of a clear white color and the same stripe pattern on both sides when produced in Masame style. And you can see the stripe pattern on both sides.
■White Giant Clamshel Go Stones, Nachiguro Slate Black Stones included. 
White Stones：180 pcs / Black Stones：181 pcs.
Include spare Go stones for the respective color, two of each.