New extra-strong ECS drive shafts. 50mm ECS set with new reinforced drive shaft, drive shaft case, and drive axle. The ECS drive shaft equalizes the speed between the drive shaft and the wheel. With a unique 2-piece joint between the axle and the wheel, the same extreme wheel turning angle is divided into two shallower angles to prevent joint binding. This means that at the same cornering speed, the inner wheel will not bind or vibrate. Drive through the corner is more stable & precise, and easier to drive.