While they probably didn't have hand spinners in the middle ages, if they did we expect they'd look like these.
This is a brass and steel hand spinner with shielded crosses on the ends and a tiger face in the middle. The finish is a distressed metal that looks like the stuff war hammers were forged from (probably not). It is very heavy and spins for a really long time.
The Medieval Spinner has a hybrid steel and ceramic bearing for truly amazing spin times.
Bonus: Comes in a metal box with a velour drawstring pouch.