Conventional silicone fuel tubing used inside the fuel tank, the tubing is easy to get kink when doing violent aerobatic maneuvers and results to short supply of fuel when the model is in air, while for K&S Kinkless tubing, as because of the material and the design used it can be bent to any direction freely. Keeps your model safer in the air. Also, including the gold UG pipe and bubbleless weight.