Specially-modified superior 351mm-long and 3mm-wide drive belt. This gear is very slim and elastic that you can for a very effective transmission that significantly decreases friction and helps to cut back battery power draw. The belt is specially hand ground on a particular device for minimal level and freedom, without impacting lifespan. To completely benefit from the benefits from these superior belts, be sure all transmission ball-bearings are definitely clean to lessen drag and friction.