The 4-Piece Steak Knife Set has sharp blades for slicing steak, poultry, and fish without tearing. They are hand sharpened to a 16-degree angle per side and have an HRC 58 +/- 2 on the Rockwell Hardness Scale. Made from 67 layers of Cangshan's proprietary X-7 Damascus Steel, each blade goes through Cangshan's ULTRA6 heat treatment to maintain strength and function. It is NSF Certified and comes with a Lifetime Warranty against manufacturer defects.