It is not often that an implement of warfare evolves into an item of jewelry. But that is precisely what happened with Chinese archer’s rings....
A number of technological developments contributed to the success of archery in north-eastern China. Among these was the use of archer’s rings, called she in ancient China (modern term banzhi). The archer’s ring is used on the thumb of the stronger hand, the one that pulls the bowstring. In addition to protecting the thumb, the ring provides a precise release action for the bowstring.
IMPORTANT: do not look at you own thumb within 5 minutes of mirin #thumbforce or you will experience excruciating thumb envy. might break you psychologically. I ... I did that already