Hand crafted full tang knives made from German X50CrMoV15 Steel for durability and edge retention, with a USPTO patented design. Each blade undergoes a 6 stage heat treatment to maintain strength and function. The 5.5" handle and 7" blade are well balanced with HRC 58 +/- 2 on the Rockwell Hardness Scale. Blade has oval depressions for air pockets to eliminate drag during carving. This Santoku knife is versatile for various kitchen tasks and heavy use. NSF International Certified with a Lifetime Warranty. Wash knives with warm water and detergent, rinse and dry carefully.