Gehmann Gyro-Twister — 718

Training device for building and strengthening arm muscles
The gyroscope effect (light, circular movements) strengthens wrist and forearm muscles in a simple and gentle way.
with additional starter cord and instructions
like 717 , but larger and heavier
The latest generation of the Gyro-Twister family with an amazing lighting effect
Increasing luminous effect with increasing rotation
Gyroscopic force: 17 kg; 14,000 rpm