250Hz Pro Blue. SPORTSGYRO 250HZ will reach 16,000rpm without vibration. Improves golf, tennis, martial arts, climbing, cycling, squash, hockey, bowling, cricket, drumming, guitar, piano Medically endorsed solution for RSI, Carpal Tunnel, WRULDs, broken bones Computer balanced. Fitted with tactile grip band for easy holding. More Speed. More Power. The power is now in your hands. The faster you spin the rotor engine, the more resistance it creates inside the shell â progressive, powerful resistance channeling directly your fingers, hands and arms. Choose slow speeds for a soothing, therapeutic force or spin fast for a powerful muscle building resistance; Powerball offers both non-impact rehabilitation or intense strengthening, the decision is always yours to make. Superb Build Quality. Engineered to perform. Built to last. The patented shell of your Powerball is designed and built to withstand heavy, repeated use plus the associated knocks & drops that sometimes come with exercising and workouts. Weâre so confident in the build quality of our products that we offer an unconditional lifetime warranty when you buy direct from the Powerballs.com website. Digital Display. Track your speed & time. Working out successfully requires monitoring and recording progress. With the built in Digital Speed Sensor, you can see what your peak spin speed is and strive to continually better and improve it, as well as total accumulated revolutions, real-time revolutions and accumulated revs within 30, 60 and 90 second intervals. Ultra-Gripâ¢ Silicone Band. Spin with comfort. With the enormous force a Powerball generates at high speeds it can be a challenge to maintain to full, firm grip. The Ultra-Gripâ¢ silicone band ensures you maintain full, comfortable contact with the ball even at high speeds. Helping you to get maximum return from your exercise. Specs: Blue shell white rotor 15,000rpm cord start LCD counter included Included: LCD Speed Meter. 2 starting cords. Instruction CD Care & Maintenance: Powerball should be used and stored in a dry, dust free environment. We recommend periodically wiping down the body shell and grip band of your Powerball with a damp cloth as this will improve overall grip during use. Powerball can be opened and cleaned if required â consult our âHow Toâ FAQs for details. Never oil Powerballâs internal components as a single drop of oil applied to any internal part is sufficient to destroy the resistance which occurs between the moving parts inside the body shell â and the ball will no longer function. Always keep a firm grip on Powerball as you spin to ensure it remains âout of the boxâ smooth for many years of operation. Digital Display: Monitor your spin performance and strength gains with the built in digital and speed counter.