Hakatai Enterprises launches the Cobblestone Series. No mold is used when forming the various round and oval shapes of the cobblestone. Craftsmen create river-rock shapes by dropping molten glass onto a flat metal surface. The color is then fired into its underside. Cobblestone tile varies in size from 1 1/2 by 1 1/4 in. to 3 by 1 in. with a 3/8-in. thickness. The sheets are mesh-mounted on the back and fit together to create a seamless surface area.