My yogi uncle gave me Baoding balls to master as a child. This guy is on another level. Note that these clank loudly if any two balls touch : r/oddlysatisfying
Baoding Balls 35MM Solid Chrome Hand Exercise Therapy De-Stressor SET OF 2 | eBay
cloisonne health exercise stress baoding balls| Alibaba.com
Baoding balls - Wikipedia
Baoding Balls More Just Your Average Stress Balls Invention, 53% OFF
Chinese baoding exercise balls used for finger dexterity, hand relaxation, as an aid in the recovery of muscle strength and motor skills after surgery. I call these fidget balls. : r/gifs
Hollow stainless steel hand balls 40mm| Alibaba.com