Bronze is made of copper and tin and often combined with other metals to produce a durable, malleable, and corrosion-resistant material. It has a patina finish that stands up to elevated temperatures and harsh outdoor conditions. Bronze rods and discs are available in different sizes and material grades and often manufactured into bushings, gears, valves, and shafts. Bronze flat bars have rectangular or square cross sections and are available in different material grades for specific applications. Bronze sheets and plates are solid, flat pieces of metal that come in different sizes and material grades. They are often manufactured into marine parts, components, and hardware. Bronze round tubes are hollow, durable, and easy to form and shape.