Solid hardwood edge grain, fits into the sink and rests on the brim of the sink.  Cutting boards are custom made to order and take 3-5 weeks to arrive.  Choose from solid Maple, Beech, Walnut, or blends of those hardwood species to get the rich look and feel you're looking for.  See the 18'-'20 sink lid and stove cover images to see how the blends of woods present various visual feels.