Instant starts are now at your finger tips; no strings required, the advanced Autostartclutch mechanism takes care of everything, just pull back and spin for the perfect start every time. Loaded with a 280Hzrotor, Autostartis one of fastest ever polycarbonate balls and can reach in excess of 16,600rpm without vibration (Persons under 12 years of age should use Powerball® only with Adult supervision) Technical specifications: Computer balanced automatic start 280Hz rotor vibration free to 16,600rpm Ultra-grip silicone band High impact poly-carbonate shell Pro with an LCD counter Weighs 265gr Inertial resistance: 14.6kg at 10,000rpm Inside the Box: 1 x Powerball® 1 x Instruction CD Autostart from Powerspin on Vimeo.