Skin doodlers are a popular pen because they provide a safe and easy to work with, steady and even ink flow on the skin that is perfect for drawing out free hand designs straight on to your client clearly so that you can both see how the design might look when finished. However, the pens themselves are actually just an ink cartridge, and just 1.6mm thick, which makes them very awkward to actually work with. This is where the pen holder comes in; providing you with an attractive, comfortable and very easy to work with mount case for your cartridges that will help you to use them just like any other pen.