Silky smooth spin with a 15,800+ RPM top speed, 250Hz is a perfect introduction to the Powerball model range and will give years of beneficial enjoyment to male and female users of all ages (Persons under 12 years of age should use Powerball only with Adult supervision) Technical specifications: Computer balanced 250Hz rotor vibration free to 15,800rpm Ultra-grip silicone band High impact poly-carbonate shell Available with (Pro) or without (Classic) an LCD counter Weighs 250gr Inertial resistance: 14kg at 10,000rpm