This is a optional ST Racing Concepts Aluminum HD Rear Shock Tower and is intended for use with the Traxxas Slash 4x4. Greatly reduce the flex of the stock plastic towers on your Slash 4x4 with this CNC Machined Aluminum HD Rear Shock Tower. This CNC machined aluminum heavy duty rear shock tower will not only add great looks to your Slash 4x4, but it will eliminate the flex in your shock tower, keeping your Slash 4x4’s suspension operating true to its design.