Ideal for plastic, metal, glass surfaces, or on (x-ray) photographs. Superfine bullet tip, line 0,4 mm. Permanent "dry safe" ink: the ink doesn't dry up, even when the cap wasn't attached for 2 weeks. Ink without xylene, nor toluene. Body and cap in recyclable polypropylene. Refillable. Sleeve with 8 felt-tip pens in assorted colors: black, blue, red, green, brown, orange, violet and yellow.