You can use it to add a shiny element to your craft projects. The ink is water-based. The round barrel is comfortable to hold and easy to control. You don't have to worry about pumping or shaking the pen, the ink is just ready to go. This Staedtler Permanent Marker features shiny, metallic ink so you can use it to add an extra element to your craft projects. It's suitable for writing and coloring on a variety of different surface types including paper, card and dried FIMO Air Clay.