This Hop-Up Option is to be used utilizing the TC-01 framework. It will help to donate to more efficient drive-line efficiency compared to using the kit standard dog-bone arranged. • Crafted in durable and rigid steel, this component can be used instead of kit-standard dog bone and glass parts, which offer true rotation at a selection of angles for free, efficient power. • suitable for TC-01 chassis automobiles. • Please note that set contains components to put together one shaft. Two sets must finish the update from front to rear.