Communicate clearly and securely with Quartet Enclosed Indoor Cork Bulletin Boards. Minimize the risk of damage to important documents. Clear acrylic windows ensure visibility for your message while locking doors secure documents in place. Information is easy to update and change. Thick self-healing natural cork holds push pins tightly and provides an excellent resilient tacking surface. Each board has a dense fiberboard backing sealed to reduce moisture absorption and resist warping. Full-length hinges. Ideal for indoor use. Available in a wide variety of frame finishes designed to complement any office interior. Choose from one two and three door models. Includes one key per lock.