Mid-size XB2 2.0mm thick aluminum framework would work for tracks which more traction is vital. Suitable for low to moderate traction songs. The 1-piece framework design with a rise of flex feature creates more general traction and improves steering. Suitable for low to moderate traction. Features extra 4 holes to install extra stiffener to minimize laterally framework flex. This help to increase rotation and precision on high level. CNC-machined from top-quality Swiss 2.0mm 7075 T6 aluminum.