Nutritional Supplements » Wings Marketing »NSD Power Essential Spinner Gyroscopic Wrist and Forearm Exerciser

1. Patented Design; Compatible With Nsd Digital Speedometer Sm-01 and Sm-02 (battery-free version)
2. Computer balanced inner gyroscopic rotor for VIBRATION FREE operation at up to 15,000 RPM
3. Worry-free to drop; Impact Resistant structure with Military-grade plastic shell that comes in an attractive color: Blue
4. Reversible inner tracks make 2X Lifespan
5. Simple to start with a pull-string (included), see video for tips and tricks