Thank you for viewing. I am introducing a natural whetstone from Kyoto Shobonzan. I received this from a member of the association, an old Nakayama whetstone. It has a hard mouth, strong abrasive power, and is a premium product. Size: 127mm x 57mm x 23mm, 580g Thank you very much. ※ Received directly from a member of a Kyoto whetstone shop association. Please be aware of accounts selling illegally excavated items by foreigners.