This Tag can be found on monosteel, san mai ,multibar forgings , annealed or hardend to help you pick the right staal for the job. 125SC w/o hardening super clean unalloyd toolsteel. hardness after quench 67 hrc temper back to suited hardness. wil produce Hamon with clay, keep the clay pattern higher up the blade to make sure enough edge will fully harden.