For indoor use only. Our boards are light duty but made to last. Use for announcements, promotions, notices and other uses in public areas. 24"w x 36"h. Board This economically priced unit is constructed with an overlap one-piece door frame. Manufactured of custom extruded, parts engineered to provided a durable and handsome cabinet. Fixed rear panels are felt (indoor use) and are designed to accommodate changeable letters with tabs spaced on 1/4" centers. Standard features include acrylic window, cam lock, satin anodized finish and black letter board interior. Includes a set of 165 count - 3/4" Helvetica letters.