It has the highest-quality aluminum meets or exceeds q801 standards exclusive to Mastic Home Exteriors, the 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. It's hangers engineered to support more weight than ordinary spikes keeps the gutter system firmly in position so water won't leak into the home, providing optimum performance over time. Free-floating hangers uniquely designed to allow gutters to slide as they expand and contract, eliminating stress on nails. It's expansion joints 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 strongest system available for residential construction protects homes by supporting up to 50 pounds per lineal foot to handle more heavy rain, snow and other extreme weather than any other gutter.