MATERIAL:Z QINGZHENG Baoding Balls are solid ball made of 304 stainless steel, with a high-polish finish. HEALTH FUNCTION:They are designed to provide a soothing and calming experience when used for Chinese therapy exercises. The balls are designed to be durable and long-lasting, and can be used in a variety of applications, including self-care, stress relief, and cognitive functions. CONVENIENT APPLICATION:Is a very simple and easy to relax the sport, just rotate your finger can control the ball movement, and you can use anytime anywhere, when you watch TV, chat, office breaks, it will make you more focused，that weight will also help with your strength training on your wrist. USER EXPERIENCE:Nice size and weight - just as described.These balls roll against each other with very little friction. I use them for plus strength、dexterity drills for both hands.Working the balls has a mild effect of reducing arthritic pain and stiffness as well.Many persons going through hand rehab or simply with stiff, arthritic hands can benefit by just a minute or two in each hand per day AFTER -SALES GUARANTEE: We not only provide high quality products, but also good quality after-sales service, if you have any questions during the use, please contact us in time. Stress Pain Relief – Hand Wrist Massage Therapy, Exercise, Strengthening, Dexterity