LYRA 797 PROFI Forest Chalk (Oil Based) is the ideal choice for professional, weather-resistant marking on many surfaces, whether wet, dry, smooth or rough. Comes with a paper label for cleaning fingers The highly pigmented oil pencil with high breaking strength has a hexagonal shape and a diameter of 12mm, for a length of 120mm. Here you get a blister with 1 chalk in yellow, red and blue.