... good quality & widely usage 3,multi model for choice Titanium tube--round tube:1.material:Gr1,Gr2,Gr3,Gr4,Gr5,GR7 ... 1 can be used in the deep drawing parts for its good elogation and excellent corrossion-resisitance.CP grade ... be used in some fittings and fastening pieces,but for complete shape need 300 degree celsius to form.Alloy ... and resonable price ,welcome any inquiries! Titanium tube--round tube