Knife ceramic chef knife Zirconia Ceramic Serrated Knife with Bending Strength from 1,000 to 1,200mPa Ceramic knives are green and environment-friendly, not broking the fibers of food and keeping the original flavor of food Features: Hardness: just inferior to natural diamonds Sharpness: easy to cut, even soft and difficult -to-cut food, such as meat, bread and tomatoes Preserve fresh taste of food: fine ceramic knife leaves no metallic smell, and preserve the freshness of food Easy to clean Many kind of size for choice from 3 to 8 inches Also different colors are available Content (wt%): Y2O3 + ZrO2 ≥99.5% Density: 6.0 to 6.05g/3 Hardness: 89 Elastic modulus: 200GPa Thermal expansion coefficient: 9.6 (10 x 10-6/k) Bending strength: 1,000 to 1,200mPa Fracture toughness: 12 to 14 (mPa m1/2)