Special pen for many special applications such as coated surfaces, nano coatings, optical glass, laboratory glass Adheres to many special surfaces which other fine markers do not adhere to The black Lumocolor permanent special F and M can also be used for marking laundry with and for a variety of outdoor applications, e.g. as a "garden marker" Airplane-safe: Automatic pressure equalization prevents the pen from leaking on board aircraft Excellent smudge-proof and waterproof qualities on almost all surfaces Dries in seconds, therefore ideal for left-handed users Colour-intensive, low odour Extremely lightfast (on smooth surfaces: red for 1 year; on paper: much longer) PP barrel and cap guarantee long service life Red and black ink colours available