Maintain the surfaces of your dry-erase and chalk boards Multi-purpose eraser removes marks quickly and cleanly. Can be used on most dry-erase and chalk board surfaces. Washable felt construction. Cleans with soap and water. Case includes twelve 2-packs of multi-purpose erasers. Charles Leonard Multi-Purpose Dry-Erase Chalkboard Erasers, 5in, Black, Case Of 24 is one of many Board Accessories available through Office Depot. Made by Charles Leonard.