Special pen for various applications such as coated surfaces, nanocoatings, optical glass, and laboratory equipment. Adheres to many surfaces where other fine markers do not stick. The black Lumocolor Permanent Special F and M can also be used for marking laundry and for various outdoor applications, such as garden markers. Airline safe: Automatic pressure equalization prevents the pen from leaking on board aircraft. Excellent smudge-proof and waterproof properties on almost all surfaces. Dries in seconds, making it ideal for left-handed users. Highly pigmented and low-odor. Extremely lightfast (on smooth surfaces: black for 7 years, red for 1 year; on paper: much longer). Black is weatherproof. Equipped with a clip. PP casing and cap ensure a long lifespan. Available in red and black. Three line widths: 0.4 mm, 0.6 mm, and 1.0 mm.