A ballpoint pen, also known as a biro or ball pen, is a pen that dispenses ink (usually in paste form) over a metal ball at its point, i.e. over a "ball point". The metal commonly used is steel, brass, or tungsten carbide.
Similar to its large predecessor, the Tool Pen Keychain utilizes a similar design, a heavy-duty six-sided barrel that houses a smooth writing ballpoint refill, hidden touch screen stylus, as well...
