The simplest types of ballpoint pens are disposable and have a cap to cover the tip when the pen is not rein use, or a mechanism for retracting the tip,[4] which varies between manufacturers but is usually a spring- or screw-mechanism. Fixative helps to Garnitur the pencil lead in place https://d-capage-laser04815.blogofoto.com/52945809/ballpoint-pen-drawing-grundlagen-erklärt