The production of high-quality ballpoint pen refills requires precision in the thousandths of a millimeter. More than 50 years ago, Schmidt Feintechnik in the Black Forest produced Germany’s first bullet mine (and today supplies almost all well-known writing instrument manufacturers worldwide). We have put together a selection of the most common formats that you can get from us without the label of great brands, but at a cheaper price. All mines have a stainless steel tip with an extremely hard tungsten carbide ball.