Spinner rings, outer band spins independently of the inner band.
When I received a request for two special spinner rings, I'd never looked closely at a spinner ring before. Thus a new learning experience began. I contacted my friend, sometimes student, sometimes partner in adventure, to let her know we had a new challenge. After much research, a little trial and error, we conquered the challenge and produced a few good looking (and spinning) rings. The phrase that kept running through my mind was "all sorts of tricky"! They turned out pretty nice, I think!