The Tamahagane San Knife series are quite high quality, extremely sharp, hard, and durable for professional use. It's beautiful design must impress you by the details of its well calculated, meticulous design. The Core layer is VG-5, High Carbon Molybdenum Vanadium Steel, is enveloped by a layer of SUS410 (13 Chrome Stainless Steel) on one side. The powdered steel contains a lot of carbon and has an unprecedented hardness of approximately 61 Rockwell.