Zbsazlat 2PCS Clear K9 Crystal Sphere Ball Chinese Health Exercise Stress Balls for Hand Massage,Stress Relief and Exercise Massage Tools and Equipment

["Ergonomic dual-ball design: Each ball measures 40mm in size. The smooth surface is easy to hold and promotes natural finger movement, thereby reducing hand fatigue during prolonged use.","Relaxation massage function: The textured surface stimulates the palm acupoints, which helps relieve tension, improve blood circulation, and thereby reduce mental stress and hand fatigue.","Durable and safe materials: Made of high-quality crystal, the surface has been polished. These balls can resist wear and tear and are suitable for daily exercise.","Enhance hand coordination: Rotating these balls alternately can strengthen the hand muscles, improve joint flexibility, and enhance fine motor skills.","Compact and portable design: Lightweight and small, these balls can be easily placed in a bag or pocket, making it convenient to engage in stress-relieving activities during breaks at work or while traveling."]