This is the Tekno 1/8th scale wing shim. The addition of the VSR 7mm wing shim elevates the rear wing of the NB48.4 orEB48.8. Raising the rear wing creates more down-force and stability at high speeds and on large jumps, and has worked well on large high-speed and bumpy tracks. Raising the wing allows it to create more consistent downforce, thus making a more consistent car throughout the corner. The 7mm 3D printed shim comes with 2 metric screws to replace the stock one, and offers a tuning option between no shim and the VSR 10mm shim.