The 7" Balustrade System Top Rail is precision molded in durable urethane and finely detailed. It is also reinforced for added strength. It compliments all balusters within the 7" system. At 12' in length, it is the longest rail available for the balustrade. When you require a standout balustrade that is also somewhat sleek, the 7" system has much to offer. The 12' top rail features a high-density polyurethane foam construction. Polyurethane has a weight and feel similar to that of pinewood. The closed-cell structure of polyurethane makes it non-porous, so it is highly resistant to damage caused by moisture, including warping, cracking and rotting.