1.Hygienic,Sharp,Rust Proof 2.Lightweight,No Metallic Taste 3.Meet EU Standard 4 ... 10 for diamond. This very hard edge rarely needs sharpening.2.Compare to steel knife1. Blade make of Zirconium Oxide , ... sharp and longer life than the traditional steel knife, with no need for sharpeningwithin 5years or much longer.3. Stain ... comfortable even in long time use. White lock blade,multi function pocket knife