These vivid markers are ideal for posters, menu boards, and sign-writing. The highly opaque pigment ink can be applied color-over-color on paper, plastic, plastic foam, wood, glass, rubber, acetate, vinyl, metal, and painted surfaces. The waterbased ink is fadeproof and permanent on absorbent surfaces yet will wash off easily from non-porous surfaces. These markers come in a variety of nib sizes. Note — The 4 mm markers have a 2 mm line writing width for creating smaller text, detail and letter-depth shadows.