A chalk pencil leaves an easily erasable mark on many materials, such as glass, metal, tiles, leather, and rubber (e.g. car tires). The chalk mark can be easily wiped off with a dry towel. Use a damp towel for rougher surfaces. Applications: Chalkboard, paper, cardboard, pulp, glass, stone, ceramics, wooden surfaces, candles, metal, plastic, synthetic materials, polystyrene, cork, rubber. Usage tip: Shake before use, press the tip against the pin until ink starts to come out, close the cap after use.