The collection primarily utilizes White Steel #2 (Shirogami #2), renowned for its ability to achieve an exceptionally sharp edge, making it ideal for precise cutting tasks.Rockwell Hardness (HRC):White Steel #2 (Shirogami #2): Typically hardened to HRC 61–62, offering a balance between sharpness and ease of sharpening. Shirogami #2 is a high-carbon steel known for its extremely sharp edge and ease of sharpening, and it is highly regarded by professional chefs. Although it is prone to rust, Shirogami #2 offers a uniquely satisfying feel as it gradually adapts to the user’s hand over time, making it a very appealing material for those who value exceptional sharpness.