Newly-designed aluminum chassis with special cutout openings for increased flex. This chassis is recommended for and works extremely well on low-to-medium traction tracks. Not recommended for very high traction conditions where the #301140 - Alu Chassis works better. This new alu flex chassis generates more traction and makes the car faster and easier to drive. Used successfully by XRAY team at all latest races, a “must have” for every serious racer.