NSD Power Winners Spinner Gyroscopic Wrist and Forearm Exerciser Featuring Digital LCD Counter Performance Digital LCD counter displays various vital workout information, including historical top speed; Certified for entry into our Monthly Top Speed Contest; See our Facebook page for more information Computer balanced inner gyroscopic rotor for VIBRATION FREE operation at up to 15,000 RPM Impact Resistant structure with Military-grade plastic shell that comes in an attractive color: Green Simple to start with a pull-string (included); Reversible inner tracks make 2X Lifespan Small, compact exercise machine you can take ANYWHERE; Provides up to 26.8 pounds-in of torque at 10,000 RPM