Hot Gyro Wrist Arm Muscle Force Power Exercise Strengthen Massage Ball TrainerFeatures:Brand new & high quality!New designed sports apparatus.Exercises arm， wrist and removes fatigue.Promotes blood circulation.Based on mechanical principal.Rotating speed can reach 8000 rev/min.Built-in LED flashlight (batteries built-in).LED automatically lights up while spinning.Anti-slip silicone wrapped grip.For people 6 years and older.Color: Translucent greenDiameter: 7.1 cm/2.8 inchNote:Do not touch rotor when it is rotating in high speedDo not put objects into the ballPlease read instruction before usePackage include:1 x Wrist Arm Muscle Exercise & Strengthen Ball