Brief XB2 2.0mm dense aluminum framework would work for songs where more security is needed. Suggested for medium to high traction tracks. The 1-piece framework design with additional flex characteristic creates more overall traction and improves steering. Features additional 4 holes to install additional stiffener to lessen sideways chassis flex. This improve rotation and precision on high rate. CNC-machined from top-notch Swiss 2.0mm 7075 T6 aluminum.