Walnut S4S boards add elegant finishing details and emphasize the special care that has gone into your home’s interior. Perfect for a variety of projects, Builders Choice premium walnut wood is easy to work with and great for machining and finishing. Boards are surfaced four sides (S4S) with flat and parallel faces and edges. Featuring only the finest grade and straight grain texture, it’s easy to achieve a natural or rustic look with millwork, furniture, shelving, and much more.