This Internal CDI Ignition Coil is made for engine kits with integrated, internal CDI's such as the Flying Horse 66/80cc Dragon Fire Bicycle Engine Kit, and the Grubee GT5 Super Rat Bicycle Engine Kit. Installation is simple- just unbolt your existing internal CDI, remove, and replace with this CDI. Tired of looking around for these CDI's? Look no further- get that Super Rat and Dragon Fire on the road with ease.