The Pearl Demon Drive offers unparalleled smoothness unlike anything else on the market right now because the smoothness and speed is achieved through the use of ultra-precise components. Self-aligning spherical bearings are used to insure the footboard and Direct Link Drive are always in perfect alignment, zero-latency Z-Link U-Joints on the double pedal driveshaft and special super high speed Ninja bearings on the axles all work in perfect sync to create the smoothest and fastest pedal on the planet. This is not a complete double pedal. This is a conversion kit to expand your pre-existing single pedal into a double pedal.