LED Gyro Power Powerball Autostart Range Gyro-powered Wrist Ball Gyroscoop Hand Arm Muscle Strength Trainer Fitness Equipment LED Gyro Power Ball Auto Start Range Gyro Power Wrist Ball with Meter Arm Hand Muscle Strength Trainer Fitness EquipmentDescription: feature: Powerball drills are completely isometric, so it can complement any training method. Powerball works the arms in a way that traditional isotonic (free weight) training cannot, and absorbs a higher percentage of muscle fibers in less time. If you want to improve your wrist, grip and arm strength, the wrist training ball is perfect for you! introduce: strong force The maximum possible rotational speed exceeds 12,000 rpm and can generate up to 32kg of resistance. It's the ultimate wrist exercise equipment product - slow spins for gentle recovery, or fast spins for forearm workouts of no more than 60 seconds. good coach Whether playing drums, piano, saxophone or guitar, musicians need to maintain finger and hand strength, coordination and dexterity. Powerball helps improve agility, speed, accuracy and stamina - if you can make music, Powerball will help you play better. Specifications: product description: Stainless steel chrome housing