Extra fine pin-type tip is 0.7 mm. This is a felt tip in metal casing, different from the plastic tip in the PC-1M Extra Fine marker.
Posca markers contain opaque water-based paint for marking on almost anything: metal, wood, glass, plastic, plaster, canvas and more. Will bond permanently to wood, clay pots, posterboard, plaster and other porous materials. Marks on non-porous/sealed surfaces are waterproof but can be removed with an ammonia-based cleaner.
Popular with surfboard designers and rock painters. Widely used for customizing things like shoes, headphones, etc. Excellent for chalkboard signs- even those exposed to the weather. Great for temporarily marking up glass windows.
Acrylic-type paint is non-toxic, acid-free, odorless, lightfast, and Xylene-free.