STRC CNC Machined Aluminum HD Rear Shock Tower (Silver) for Slash 4x4 Greatly reduce the flex of the stock plastic towers on your Slash 4x4 with our CNC Machined Aluminum HD Rear Shock Towers. These CNC machined aluminum heavy duty front and 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 4x4s suspension operating true to its design.