For permanent labelling of dark and transparent materials such as metal, glass, plastic. Waterproof, heat resistant up to 400 °C, lacquer-like opaque, low odour and extremely light-resistant. The colours yellow, white, silver, orange, brown, purple, pink and light blue are up to 1000 °C visible pen with closed cap vigorously shake, then open, place pen tip on a piece of test paper and carefully pump up and pump. Main Features Functions Writing color Black Product color White line width (min) 2 mm line width (max) 4 mm Packaging content Quantity per pack 10 pieces(s)