Su Jok Massage Ring and Stick

Su Jok is a modern version of traditional acupuncture, with roots in Korea. My parents went to Tylösand Spa and came back with a massage ring and stick from their shop-of-weird-stuff.

These are small mean-looking wire tools that you are supposed to roll on your fingers or between your hands or feet until they're all warm and tingling.
It's effect is related to that of acupuncture or acupressure, with zones in the hands or feet corresponding to different body parts. I am not sure about what I think of all of this, but it does feel really nice and soothing for tired hands and feet.