This is a set of 5 pieces of polishing whetstone scraps from Minamimaki Village, Gunma Prefecture. They have been shaped to some extent by a amateur's hand. The surfaces have not been flattened. It's difficult to see, but the triangular, whitish one is a blue whetstone. I don't know if they are usable, so please use them at your own risk. Please understand and purchase accordingly. - Type: Natural whetstone scraps - Quantity: Set of 5 - Types: White whetstone, Tora whetstone, Blue whetstone Thank you for viewing.