... SGS certificated.Advantage of Middia Cermaic Knives:1.Middia ceramic knife is made of zirconium oxide,strong enough that ... powder,it's so easy broken.2.Middia knife blade is extra sharp that can cut A4 paper ... Because of import high purity zirconium oxide blade,so it is as white as jade,check it under the ... strong light,blade is jade-like appearance, make ...