Material Copper, Brass , Aluminium , Phosphorus Bronze, Gun Metal, Lead Size 2 mm OD to 152 mm OD Swg. 24 , 22 , 20 , 18 , 16 , 14 , 12 , 10 Swg. Specification IS BS ASTM Hardness Soft , Half Hard , Quarter Hard Etc. Special Tube Referigeration Tubes Annealed Tube Etc.