This high-tech aluminum alloy is stronger and more rigid than the competition's best metal, plus a double-coating of the proprietary Alumalure 2000 finish delivers an exceptionally durable, smooth surface. With hangers engineered to support more weight than ordinary spikes, it keeps the gutter system firmly in position so water won't leak into the home, providing optimum performance over time. Free-floating hangers are uniquely designed to allow gutters to slide as they expand and contract, eliminating stress on nails. It's expansion joints are engineered for normal expansion and contraction, which can be problematic in longer runs and hip/roof installations, an advantage not available for seamless gutters. It's the strongest system available for residential construction, protecting homes by supporting up to 50 pounds per lineal foot to handle more heavy rain, snow and other extreme weather than any other gutter.