The external stairs has the surfaces natural cleft or flamed while the risers is always flamed. The step could be traditional, with thickness on 30, 40, 50 and 60 or solid, with thickness 120, 130, 140, 150, 160, 170, 180 and 200. The frontside of the step could be split, flamed or sawn and chamfered. For interior the surface could be polished or honed. It is also possible to have a "row" surface, called brushed, to maintain the same wiev of the external. The edge can be polished, honed, bullnose or rounded.