Raw Stone As Is Japanese Natural Whetstone For Tomo Nagura ,koppa Making.

Photos are just examples, soft to standard, a little hard stone for nagur a or stone slurry purpose.

Size is from finger to palm length or less , for easy to use by using diamond whetstone for flatten.

Raw stone, needs to be cut , flattened for use,

To make Tomo Nagura, koppa etc.