RYUJIN Professional Japanese Chef Knives & Set with Rolling Sharper & Cutting Board Ryujin Handmade Personalized Japanese Chef Knife Set AUS 10, 3 Layers Clad Steel, 62+ HRC - 5 Piece Knife Set with Sheath - Exotic Rose & Ebony Wood Ergonomic Octagonal Handle, Durable & Extremely Sharp Chef Knife Set includes Knife Sharpening & Personalization with Optional Cutting Board or Diamond Rolling Sharpener. Japanese AUS-10 Blade Detail: The blades are expertly crafted from AUS-10 Japanese Tool Steel, known for its exceptional hardness and corrosion resistance. AUS-10 is a high-performance steel that provides a strong, razor-sharp edge while maintaining excellent durability. The blade is constructed using a three-layer process (San Mai), where a core of AUS-10 steel is sandwiched between two softer layers of protective steel. This cladding technique enhances the blade's toughness, offering flexibility and resistance to chipping while keeping the core steel sharp and resilient.