This is a solid piece of red clay, designed to be used as a step bull-nose in a stair. Each piece covers about 1 sq ft. The second picture shows how to use it in a wide step with a Mexican tile raiser. The steps shown in the pictures are sealed, we sell them in their raw form, not sealed.The bullnose radius is about 1 3/8"", which is the thickness of the bullnose hanging down at the corner side.