Rubber/Synthetic
Symphony composite slate shingles is a masterpiece of synthetic slate design with enduring qualities of tooled craftsmanship, natural beauty, and harmony. Symphony is a specially-engineered composite roofing shingle that mimics the look and feel of natural slate, but is lighter, more durable and a fraction of the price. The Symphony product line has earned the designation as an ENERGY STAR® Qualified Product, a label given to products that use less energy, save money and help protect the environment.
http://www.certainteed.com/Products/309040
Authentic Slate is a product that will last a lifetime; with the ability to withstand the most extreme winds, bullet-like hail and even fire. A color-through product that will survive the sun’s harmful UV-rays, enabling its appearance to remain unaltered decades after it was installed. And, a roofing product that was “green” long before eco-friendly roofing became “a good idea”. All this, while still being light-weight and easy to install so that the money invested would be in the material and not in the labor to install the product.
http://authenticroof.com/why.asp