Save paper by using a time-tested and reusable writing surface. Black chalkboards are the perfect size for school, office, and home message centers. Works well for handwriting practice, working equations, brainstorming, and more. Rounded corners and smooth edges for safety and comfort. For use with white and color chalk and felt erasers. Hardboard backing is warp and chip resistant. Comes with adhesive squares for mounting. Measures 18" x 24" 0.125".