Authentic Black Steel pipe in diameters from 3/8th in to 2 in.(coming soon) All of our pipe is welded black steel, schedule 40 thickness and hydrostatically tested. All threads are astm a53 spec and fit cast iron fittings of the same size. Our authentic pipe is made for industrial use. It can handle air pressure, gas, and liquids. Your decor projects will stand the test of time.