Xerceo All-Metal Auto-Start Power Gyro Ball, with LED Light, for Wrist & Forearm Training (Black Hole)

["Wrist & Hand Workout: Strengthens muscles and ligaments in hands, wrists, and forearms; perfect for athletes and office workers.","Upgraded Design: All-metal, cordless, and weighted wrist ball for enhanced safety, strength, and durability.","Advanced Engineering: Integrated core and reinforced spring for smoother, quieter, and faster performance.","Easy to Use: Push, release, hold, and rotate—simple operation for an effective workout.","Reliable Support: 100% factory-tested for safety. Free returns for defects and responsive customer service."]