1 enviroment friendly: lead free, non-poisonous,nveer got rusty,the most ,health tool ... know as “noble knife”,its’s apprearance as pure ,the ceramic knife possesses a jade - like soft whiteness . its sharp ... zirconia, never be worn and torn.2. enviroment friendly: lead free, non-poisonous,nveer got rusty,the most ,health tool ... easily and cleanly. 4. will never change (its) colour ceramic paring knife