Professional S knives are perfect for professional and amateur chefs. Made of Special formula high carbon NO STAIN steel. SIGMAFORGE - forged from a single piece of solid steel. Ice-hardened FRIODUR blade starts sharper and stays sharper longer. Precision honed blade and laser-controlled edge. 57 Rockwell Hardness = excellent edge retention. Dishwasher safe but recommend hand wash. Includes: 4" Paring knife. 5" Serrated Utility knife. 5" Hollow Edge Santoku knife. 8" Chef's knife. Kitchen shears. 9" Sharpening Steel. 10-Slot Birchwood knife block.