This five-pack of durable DFX Power Cord Gyro Starter Strings makes activating your gyro hand exerciser quick and effortless. Designed for comfortable handling and repeated use, each cord delivers a smooth, dependable spin every time - so you can start your training without delay and keep your workouts consistent. To use the gyro, insert the tip of the string into the hole on the rotor, then hold the device firmly and wind the string tightly around the rotor for one full turn, ensuring it's snug. Position the gyro in your palm with the rotor and string facing downward, then pull the string straight down in a quick, firm motion, avoiding any angled pulls. As the rotor starts spinning, immediately rotate your wrist in a circular motion while keeping your arm still, allowing only your wrist to move. Continue to find your rhythm as you match the gyro's momentum, feeling the resistance increase with faster rotation. Fits All DFX Gyros (Gyro NOT included)