Sycamore, about 6 1/2" tall and 3" diameter. Dyed with textile dyes, carved (the vertical groove) and milled (the recess for the button). The button itself is made from padauk. Finished with a bit of satin acrylic lacquer.
This is essentially a prototype, and I have a few more along similar veins, with variations on the theme.
Before anybody says it, I will say it myself: yes, there is a small scratch in the wood. All C&C welcome.