Titanium has excellent biological consistence,strong cautery-resistent,low specific gravity,high intension,no metal smell and no magnetism.We choose the Japonic SELECAST titanium cast system which made in Germany.Our titanium-piece is the same brand.There are 3 types: 20g , 30g and 40g . Hallmark:Ti>99.585 Fe>0.20 N>0.05 O>0.15 H>0.015