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. Using ballpoint pens to create artwork is not without https://andrepfsgu.thezenweb.com/the-ultimate-guide-to-ballpoint-pen-drawing-59333981