No rust or changing colors and diffluence of metal ion,it would be more healthy and environmentally-friendly. Content of knives: paring knife, utility knife, santoku knife, slicing knifeAvailable size: 3"5"6"for bladeBlade colors: white and black or at customer's requestHandle colors: black,red,yellow,purple,green,blue or at customer's request.Blade material: zirconium oxide(ZrO2)Handle material: ...