Aztech innovations scythe split gearbox. Anodized copper color quick change spring system. Comes with Aztech anti rotation bushings pre installed. Aztech innovations Apache tappet plateless cylinder head and aztech innovations accu port piston head. Everything is new. Started a full aztech build but never got to finish it so none of these parts have any rounds through them. All top of the line parts perfect for that premium build project. Selling as complete set but contact me if you are interested in only a certain item