Chinese stress balls (Baoding balls) were created during the Ming dynasty (1368-1644) in Baoding, China. Originally made of iron, the balls are thought to relieve stress because they touch pressure or acupuncture points on the hand.
Baoding balls
Chinese stress balls (Baoding balls) were created during the Ming dynasty (1368-1644) in Baoding, China. Originally made of iron, the balls are thought to relieve stress because they touch pressure or acupuncture points on the hand.