This adhesive chalkboard decoration offers a smooth black surface for writing with chalk or Bistro markers. Chalk can easily be erased with a damp sponge without leaving marks. Includes 3 pieces of chalk. Sheet dimensions : 45 cm x 145 cm (18" x 57") Features: Removable and repositionable Works on walls, wood, glass, paper and more Easy to remove, won't harm most surfaces Please note: It is imperative that freshly painted walls be allowed to dry for a minimum of three weeks before applying wall adhesives, as the humidity may cause peeling.