The U-Mark A10 Paint Marker is highly visible and permanent on most surfaces such as metals, plastics, wood, glass, ceramics, corrugated cardboard and more. Which is why this marker is preferred by high volume indutrial users, but is also great for marking, color coding and labeling at home. Each heavy duty tip is reversible as a 2 mm bullet tip or a 4 mm chisel tip. Available in a 6 color set of black, blue, red, white, yellow and orange.