Sizes: 40mm, 45mm, 50mm, 55mm, 60mm China Health Ball is a traditional folk fitness device designed to support hand, wrist, and arm health. It helps to improve memory and gain positive energy, keeping your hands, fingers, wrists and arms healthy. How it works: When you roll two light balls clockwise or counterclockwise, it stimulates points on the hands and fingers. The muscles stretch and contract rhythmically, which also stimulates the wrist. Key benefits: Manual movement exercises the brain. While playing the health ball, thoughts focus on the hands, helping to relieve tension and relax the brain, supporting overall hand health and mental calm. Use scenarios: - Office breaks: perform short sessions to ease hand and forearm fatigue during long tasks. - Gentle rehab or senior use: safe, low-impact exercise for hands and wrists. - Home or travel: stress relief and improved mental focus, plus maintained finger dexterity for musicians, typists and other tasks.