MOST POPULAR FOR BEGINING COLLECTORS AND PEN MAKERS. It seems like every pen turner starts out with a slimline pen. It is normally priced at the low end of the spectrum. It is a twist pen. There are several varieties of this Slimline pen. Some with more sophisticated twist mechanisms, others with high-tone fittings. Usually these variations call for a slightly beefier barrel. When fitted out with all the extra luxury fittings and modifications, these pens can start to compete with some of their more formal (and more expensive) cousins. Another good bang for the buck, with lots of variety.