Gyroscopic Strength Ball By Science Museum

• The most enjoyable way to exercise and strengthen your hand-grip and forearm.
• Switch on the LCD Revometer, and using the pull cord provided, spin the internal gyro.
• How many revs can you build by spinning your wrists? The record stands at over 14,000 RPM!
• As the revs build so does the torque, making it a real challenge to control.
• Batteries included.

As new boxed with one month guarantee