Asphalt Shingle is designed for slope Roof( Gradient: 15°- 90° ), which are composed of : a base material---glass-fiber mat which provides support for the weather-resistant components and gives a shingle strength; asphalt and fillers; and surfacing material, generally in the form of colored mineral granules,our products use high-temperature sintering basalt granules, that provides more protection from impact and UV degradation and improves fire resistance.