Heston Blumenthal's favourite knives, Tojiro Senkou blades are crafted from 37 layers for the small knives and 63 layers for the large knives, (19 layers for the Deba knife).
The inner core and blade edge is VG-10 steel, hardened to Rockwell 60 - 62, allowing for a razor sharp edge. The softer outer layers help protect the special core steel. The handles are manufactured from hard wearing micarta combined with deuxe 18/10 stainless steel. No wonder Heston chose them as his luxury item on Desert Island Discs!