Adjust the chassis flex by connecting this carbon brace between the upper bulkheads on top of the top deck. This upper bulkhead brace is cut with high precision from 1mm carbon plate and can change the steering and traction characteristics by effecting the rigidity of the front or rear bulkheads. Front of top deck: Good balance between high-speed and low-speed corner. Rear of top deck: Good balance between rotation and traction.