Random flagstone (also called Random slate and Irregular Slate) includes the regulation random slate and no regulation random slate.1. Regulation random slate: It's the natural disorder and imitates the beauty of nature. It can extend with limitless from four sides. Such kind of pavement slate can save much building time and procedures. 2. No regulation random slates: It is made of different kind shape and color slates. Also it will save much cost and color slates. Also it will save us much cost and looks very beautiful as the wall building materials.