material :TA2,TA3,Gr2,Gr3 use: for skull size:0.5*(300-500)*(1000-2000)mm standard:GB/T13810-2007,ISO5832-2,ASTM F67 The introduction to product:material :TA2,TA3,Gr2,Gr3use: for skullgeneral: size:0.5*(300-500)*(1000-2000)mm 0.6*(300-500)*(1000-2000)mm 1.0*(300-500)*(1000-2000)mmstandard:GB/T13810-2007,ISO5832-2,ASTM F67tolerance:+/-0.03The advantage of Material TA2,TA3 ,GR2,GR3 : 1) ...