Make an old chalkboard or a worn out dry erase board new again! These rolls make it easy to do. Each roll has a full-adhesive backing, so it's easy and convenient to put up. Create a dry erase board almost anywhere! Works on conference room tables, desks, walls, doors and almost any hard, smooth, clean, non-porous surface. Won't leave residue behind and erases cleanly. Recyclable. Each roll measures 24" x 20'.