Save paper by using a time-tested and reusable writing surface. Black chalk boards are the perfect size to store in students' desks or notebooks. 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. Measures 9.5" x 12" x 0.125". Class pack of 24. For best results, we recommend priming your chalkboard prior to use by taking the side of a chalk stick and rubbing it on the entire surface of the board. Wipe chalk off with a dry cloth and use. A damp microfiber cloth can be used to clean the surface of your board. Do not over saturate. Priming may be required after cleaning."