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NSD Powerballs are finely
engineered, precision crafted
gyros consisting of a rapidly
spinning rotor enclosed in a
solid [hand held] outer sphere.
You set this rotor in motion
using a cord or your finger
and build its speed by subtle
rotation of the wrist. It
contains no motor or
batteries. All of the energy
required to spin the gyro is
generated by the user.
The faster you spin the inner
rotor the more inertia it
generates and the more
resistance it subsequently
inflicts upon the fingers,
hands, wrists, arms and
shoulders. The stronger you
are, the faster you will be
able to make your NSD
Powerball spin. Most models
have electronic counters built
in which will allow you to see
how fast you managed to spin
the rotor (and keep a record
of your progress).
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