Metal Head industrial marker pen from Markal. The pen is entirely made of metal and has a 3 mm (1/8") metal ball at the tip that can withstand even the toughest surfaces. At the back of the pen, there is a rubber pump so that you can build up pressure in the pen and thus get a perfect flow when writing. Markal Solid Barrel Metal Marker 3mm is filled with glossy enamel paint that adheres to almost all surfaces and can withstand tough weather and sunlight without fading. Made in the USA.