Dear sir, We can supply you double-wall rolling brazed steel tube(Bundy Pipe).The product possessed the characteristics of excellent tensile, shock, unti-fatigue, high temperature and high pressure resistance. Sametimes it also has characteristics of little internal-resisting, draining protection, light weight, high strength, low price and etc. comparing with copper tube, so it's a ideal product instead of copper tube now. The tube can be used in general projects, especially in the field of refrigerating industry as a condenser or vapourizer; automobile industry as oil tube; oil return tube or brake tube; heating tube in the heating system. Surface of tube can be plated by Zinc, Lead, Alloy of Lead and Tin, or coated by PVF widely used in industry.