This knife is a flagship of the sheath knife of ROCKSTEAD. The shape of our blade is made from a consecutive convex surface. This is a technology that doesn't permit other follows, and we have confidence in this surface. When you strongly press this knife against the telephone book, it will cut like cutting butter. Please confirm our HONZUKURI blades that evolved. ZDP189 is a powder stainless steel material developed for cutlery. It is a product of the nano tech. However, it is an unsuitable knife to the beating cut. This knife is narrow tang. This knife begins selling in 2013. We are accepting your reservation.