I display/sell mostly "kit" pens. I offer a select group of pens that have no clip, but instead have a sterling silver 'roll stop'. The intended buyer is the group called "Female". These take significantly more time (time=money) to mount the roll stop, as I usually machine out the finished pen upper barrel a bit to accept the sterling 3-D image. The response is that I get a level of interest, but sales are modest at best compared to typical pens. Still, it is a variation of concept, and does result in sales. The sterling images are typically ebay sourced 'charms', pendants, earrings, and are often in the price range of $7 +/- each.