Revolutionary FC61 steel core features fine carbide distribution and is protected by a durable 48 layers of damast steel Fine carbide distribution creates a razorsharp and durable blade with a 61 Rockwell hardness Double icehardened FRIODUR blade offers remarkable durability and cutting edge retention Blade is handhoned using the historic Honbazuke method to an exceptionally sharp 95 to 12 degrees Authentic thin Japanese blade profile