I made one of them for my wife. These are one of the first ten pen's I made.
There is material to make a few in black and white, blue or purple streak and know there are some more colours available at my rods supplier. They can be made as turn cap or friction cap. I can also design them in a bamboo style withe decorations rings which is I thing the best style.
The two with a middle ring were sold on the Sheffield Penshow 25 November 2018
SAMPLE - Can be made to order - if you want a bit different shape then that is also possible