These realistic stones are handmade of high-density casting plaster. Cast in solid colors so that when trimmed, the edges do not show white, but rather their natural color. They can be easily cut with an X-acto® knife by scoring the surface and snapping at the score. Each bag covers approximately 100 square inches. To finish the stones shown above follows these instructions. Stones should be glued in place with #1250 Weldbond or your favorite adhesive and allowed to dry. Then the stones should be sealed with a non-yellowing sealer (for example, Delta Ceramcoat satin varnish) and allowed to dry. This helps protect the stone from the slightly abrasive mortar. Apply #2076 Mortar Mix between the stones. Add a top coat of sealer, if desired. Instructions included with stones. Largest stone: 1" x 1/2"