Ginsu Kotta Series Japanese 420J2 Stainless Steel 5-Piece Stainless Round Prep Set 4879 Unique double edge blade for precision cutting Serrated knives never need sharpening for strength and durability Commercial quality Japanese 420J2 stainless steel blades Each stainless steel handle is beautifully shaped and ergonomically designed to fit smoothly into your hand Hand wash only; limited lifetime warranty