Advantages: - Chemical pencil. - Robust graphite. - Solid graphite. - Does not break when writing.Additional information: - Pencil length 24 cm. - Ideal for wet and damp surfaces such as: wood, Wet and dry surfaces such as concrete, masonry, paper. - Leaves an indelible residue when wetted with water and is therefore not suitable for painted surfaces. It is not suitable for painted surfaces as it may bleed through the paint.