UNI POSCA Acrylic Paint Marke - Mark in vivid color on practically any surface. The opaque, waterbased ink in Uni Posca markers dries to a matte finish on both porous and non-porous surfaces. Odorless, fadeproof, and bleedproof, these markers are great for posters, signs, sketching, lettering, graphs, and charts. Use them on paper, matboard, wood, styrofoam, metal, plastic, vinyl, glass, and more. Vivid colors like poster colors. Since it is an opaque ink, it can be vividly colored and overwritten even on plastic or metal with dark color. With a wide variety of pen tip thicknesses and ink types, it can be used for a variety of purposes. Pen core: Felt fiber Ink color: Black Type: Extra thin 0.7mm