Left turn gear and right turn gear, each with a 608 ball bearing at the underside.
2 jigsaw bases that can be snapped together to make a set of 2 pen holders, or they can be used as 2 separate holder. :
Assembled to a set of 2 pen holders. They can be rotated together.
One downside : The jigsaw bases required extensive filing because they do not snap together as is.