These balls are a classic Chinese fidget toy. These are called health balls, or Baoding balls, and are magnetic spiky balls. The purpose of the balls is to be a calming stress reliever toy. Place both balls in one hand and rotate them around and around. The soothing motion and gentle sound makes it a very soothing stress reliever. The spikes make it a soothing massage and acupuncture therapy. Balls are 1.25″.
Baoding balls are a Chinese invention designed to help relieve stress while building finger dexterity and wrist and forearm strength. Known also as Chinese therapy balls or harmony balls.