|For those beloved 300 class helicopter, the troublesome tail is lethal weakness. The Neon series Belt Drive conversion kit is designed to solve this problem in a Cost Effective way. In the conversion kit, you will have the Neon Series Fiber Frame, in 12mm boom mount, plus a 275mm Tail Boom and the full tail kit. You are able to select different main shaft diameter in order to fit your head. Different main / tail gear ratio can be achieved via different Belt Gear pairs. (optional from 3.6~4.2) So for low headspeed FP, you may have a higher ratio to keep the tail tight.