Koppa Origin: Ukyo Ward, Kyoto City, Umegahata Mountain: Ayame Tamagoya Type/Layer: Iromono Tomae Maximum Dimensions: 55 x 135 x 17mm Weight: 297g Hardness: 3.8 (※Hardness scale of 5: Hard 5 ⇔ 1 Soft) Due to the product being listed on multiple sites, there may be a time lag and the item may be out of stock. It has a silky smooth texture like a maiden's skin, and black liquid will come out with three and a half strokes. The forests have been devastated for a long time, and dreaming of their recovery, we have finally arrived at the Tamagoya Tonikakusugoi after steadily continuing the restoration of the mountains. Please give it a try. How about one for a mine opening celebration? Please send us your feedback. ・About Natural Whetstones from Umegahata, Ukyo Ward, Kyoto City A finishing whetstone made of slate that is produced only in a very small part of Kyoto due to the effects of crustal movement. It is considered indispensable for finishing blades due to its extremely fine finish. It is said to have a hardening effect on the blade edge, and the finish that highlights the boundary between the jigane (soft steel) and the hagane (hard steel) cannot be reproduced with artificial whetstones. I have been an apprentice whetstone craftsman under the master for about 10 years in Umegahata, Ukyo Ward, Kyoto City. I am still in training, but thank you for your support. I have obtained permission from the landowners to mine natural whetstone rough stones from the mountains. I perform ore selection, forging, sawing with a chip saw, and surface finishing. I am still an apprentice, so there may be some imperfections, but please forgive me.