These obstacles are precision cut from the highest quality scratchproof granite. The edges are rounded for a smoother grind, and the whole thing is polished smooth as a granite countertop. The design allows it to be placed upright as in the picture and used as a u-ledge, or on it's side as a c-ledge. Colors are random and include black, grey, orange, and white. The bottom is now polished too, so you can use it as a flat ledge.