Is there a toy that turns on your fingers, not the kind with a nail top, but the kind that fits on your fingers?
You can buy a jade finger wrench in a jewelry store or an antique market. This finger wrench is set on your finger to play with. A valuable fingerboard is worth hundreds of thousands or even more. If you like collecting, you can consider it. Of course, if it's just for fun, just buy an ordinary jade fingerboard for a few dollars.