1,confirms to all test certifications 2,good quality & widely usage 3,multi model for choice Titanium tube--round tube:1.material:Gr1,Gr2,Gr3,Gr4,Gr5,GR7,GR9,GR11,GR12 etc2.standard:ASTM B/ASME SB861,337and 3383.specification:outer diameter:.4-130mm leangth:up to 15m wall thickness:0.4-10mmCP grade 1 can be used in the deep drawing parts for its good elogation and excellent corrossion-resisitance ...