5" Santoku Knife in Vein Turquoise: Double-Sidedby santa fe stoneworks santoku knife with a hammered 5" damascus steel blade and vein turquoise inlay on both sides of the handle. damascus steel is characterized by it's strength, edge holding ability, and it's dramatic appearance. the damascus steel used in these knives comes from japan and is called "sanmai damascus" or sandwich damascus. there is a core of vg 10 steel with 16 layers of stainless steel on each side to produce a rust free damascus