These markers are ideal for marking and labeling almost all materials, including paper, cardboard, metal, plastic and glass. The ink is waterproof and wear-resistant on almost all surfaces, and the round nibs produce a stroke width of 1.5-3mm. This set includes one each of black, blue, turquoise and carmine.Details:Includes assorted colorsSet of 4 mini permanent markersRound nib (1.5-3mm width)Low-odor ink has no added toluene/xyleneQuick-drying ink produces long-lasting marksCap can be stored on the end of the barrel to prevent risk of losing itMade in Germany