The Tattoo Pen is the only pen made specifically for drawing directly onto the skin for pre-tattoo purposes. The Tattoo Pen boasts a 1.6mm ball point, a sturdy 100% solid brass refill, an easy to change out solid steel holder, comes in purple ink, and was specifically researched and developed to work with a tattooers proper need to draw directly onto skin. It was created, tested for tattooers, there is absolutely no substitute for the Tattoo Pen.