Porcelain enamel finish baked onto steel construction for a very durable and extremely smooth surface that is easy to clean. These traditional butcher trays feature one large mixing area with a slightly convex center so that water will run to the edge. Perfect for dry brush technique in watercolor or gouache, where less water is desired when mixing colors. Size and style slightly vary from manufacturer's description. Size will measure within an inch of manufacturer description, and the sides are either perpendicular to the bottom and 1 inch tall or they are slightly angled to the bottom and 1 1/4 inch tall.