Titanium Ring 1.Grade:Gr1,Gr2,Gr3,Gr4,Gr5 2.Standard: ASTM B381 3.Certification:ISO9001 Titanium Ring :Standard: ASTM B381Material: Gr1,Gr2,Gr3,Gr4,Gr5Size: According to customer's requirementState: MIf you have any problems,you can feel free to contact me! Gr.5 Titanium Ring