Seamless gutters are the most popular type today. The biggest selling point is that they don’t have any seams which could potentially leak. The sections join only at inside and outside corners and at downspout outlets. Seamless gutters are usually formed from aluminum that has a baked-on finish, but they may be made from copper or factory painted steel. They are made with a special machine that's brought to your home by a gutter contractor. These types of gutters can not be installed by the do-it-yourselfer.