1,7" new chef knives 2,sharpness and hardness 3,never rust 4,eco ... bamboo chopping board passed FDA and LFGB certificationCharacteristics:1. Knives have a unique blade made of zirconium oxide, an advanced material ... marble, stone, glass, or tile.Use your conventional steel knives for carving, prying, boning, and cutting frozen food and ... of the blade 7 inch eco-friendly new chef knives with ABS handle