From the A.G Russell Knifes website:
The Ultra-Chef Knives in Cocobolo are classic in design and state-of-the-art in performance. Each blade, except the bread knife, is 33 individual layers of stainless steel – 16 layers per side plus the center layer of VG-10 Cobalt stainless steel hardened to a Rockwell of 60-62. These knives are incredibly strong, light in the hand, well balanced and extremely sharp. The handles are made from select Cocobolo, long considered one of the world’s most beautiful exotic hardwoods. Each knife is individually gift boxed. Made in Japan.