Rosewill 4-Piece Ceramic Knife Set R-CeR-KN-01 6" Chef's knife. Blade: Thickness:1.8MM, Width: 35mm 5" Utility Knife. Blade: Thickness:1.7MM, Width: 28mm 4" Utility knife. Blade: Thickness:1.5MM, Width: 21mm 3" Paring knife. Blade: Thickness:1.5MM, Width: 21mm Ceramic blades are ground to microscopic precision for excellent sharpness retention; knives do not need sharpening. Easy to clean and will never rust.