Strengthen your arm muscles with this nifty little device. Pull the red cord to get the gyroscope inside the ball rolling, then by using hand rotation, spin the internal gyro and challenge yourself and others to achieve the highest revolution per minute. The digital counter measures the speed of the gyroscope and displays the number of revolutions per minute (RPM). Great for strengthening for sports of all kinds.
• Gyroscopic exercise ball with built in rev counter
• 2 x LR41 1.5V batteries included
• Pull string
|colour||Pearl / Orange|