The core is made of VG10 stainless steel manufactured by the Japanese steelmaker Tafeku. It is a steel with a high carbon content, for a stainless steel (more than 1%, i.e. 0.5% more than standard steel), as well as a high Cobalt content. It has a higher hardness of 61 +/- 1 on the Rockwell scale. This alloy has revolutionized the world of cutting because blades made of this steel have all the attributes sought after in cutlery :
GOOD EDGE RETENTION
Also, because of its hardness, this steel will be sharpened longer with the same quality of cut and cutting hold.