Why should the semi-round drain system be installed?

The Rar Acoperis team, since the beginning of its activity, has been installing only the semi-round rainwater system, with a double layer of paint on both the inside and outside, with the highest amount of zinc, namely 275 gr/m2. The thickness is 0.57 mm, and the warranty is 30 years. With the installation carried out by our team, this system can withstand a weight of over 200 kg, does not lose its color and does not rust.