Miyabi Kaizen Miyabi Kaizen. These knives are excellent values for Japanese designed Damascus clad knives from Miyabi. The core steel is VG10 (HRC 60) and is clad in an attractive Damascus pattern. The blade undergoes a four step hardening process which improves edge retention and durability. The handle is made of black linen Micarta with a decorative pin, red spacers, and a metal end cap.