[A part that is useful for improving the performance and setting of RC cars]

Aluminum damper mount/stiffener that attaches to the roll cage under the roof. By rigidly connecting the left and right sides. not only does it increase the rigidity of the entire chassis. but it also increases the mounting strength of the damper. It improves rear wheel traction and stabilizes handling.

[Basic specifications]
Consists of a silver anodized aluminum machined damper mount bar and mount adapters (2 pieces)

[Manufacturer page]
https://www.tamiya.com/japan/products/22089/index.html