This is an option aluminum servo saver arm. Machined from high grade aluminum this servo saver arm will create a smoother feel to the steering as there will not be any flex in the arm compared to the stock plastic servo saver arm. X8/E, X8T/E
Just go ahead and order one with your kit. The kits are so good that you really do not need to upgrade anything. But, having the peace of mind knowing that your steering and servo saver is going to stay a bit more consistent and have a bit more strength is worth the small additional cost for a part that will never wear out, break, or have to be replaced.
This is a must have upgrade. Helps keep the steering tight and consistent. Easy to install. Helps keep you on the track longer!!