I purchased a set of shocks for my Tamiya M05. They were to replace my broken shocks from 3Racing. The shocks are delivered unassembled, but easy to build with a little experience. It is not a con to learn to build your shocks. The super soft (red) spring is not as soft as i'd wish for. The springs are also very short. The cylinder nut has to be adjusted halfway down the cylinder in order to fasten the spring. It the 3-racing dampers are available, I'd rather buy them.