Epic Grip - Arms Redefined. The smallest, quietest and one of the most powerful models in the current main Powerball product range, Powerball Evo Diablo Autostart focuses up to 27kg+ of gyroscopic inertial resistance directly onto the wrist and forearms and is one of the most efficient forearm workout, wrist and hand grip strengtheners available on the market today. Yet at low spin speeds, the small shell size allows Diablo Evo to fit snugly into the hand where its smooth, 100% non-impact resistance can gently rehabilitate elbow tendonitis, carpal tunnel syndrome, tfcc tear, repetitive strain injury, wrist pain, tendonitis wrist and numbness in hands. Used just 5 minutes each day at these low speeds, this medically approved product will also help to dramatically improve strength and flexibility of the wrist joint and reduce overall recovery time from injuries like scaphoid fracture, broken / sprained wrist and forearm. Small, compact and always ready to use, simply wind the cord around the rotor (see video above), give it a fast pull and start spinning - the faster you rotate your wrist, the faster the rotor will spin inside and the more resistance Powerball will create, leaving you pain free and strong from finger to shoulder and building powerful upper limbs in a fun, engaging way that's totally unlike any form of exercise you've ever experienced. Powerball Diablo is supplied in a clear perspex storage case that keeps it safe and dust free in between uses. Please continue reading below for more details.