Nature slate is nature materials, which have the characteristic of exquisite ? flaming ? acid-resistant ? fire-resistant ? weathering resistant. The radioactivity of the slates is too low to influence human's body. Slate are well-liking construction material, it is can be use for the wall, roof tiles, outer door scene, paving tone and so on. The natural slate may have chromatic aberration, But the characteristic make people love it very much.