1,3pcs hardness ceramic knife set 2,eco-friendly 3,SGS,FLGB,pony testing 4,edge hardness and sharpness ceramic knife Main features:Matte surface finish blade made of zirconium oxide Zirconium material keeping 85 degrees hardness just second to diamond which give ceramic knife its outstanding sharpness and edge retention Customized company names/logos on blades and packings are accepted ...