Serpent have release a number of new option parts for the S411 touring car starting with these spring steel double joint cardan shafts with double cvd joint. To be used with a front spool, they reduce vibration, increase steering, and offer smoother operation due to less binding. Also new is a CVD shaft combo with spring-steel axle and hard anodised 7075-T6 aluminium shaft. Lighter than the full spring-steel version but more prone to bend or break in the event of a crash. There is a new belt tensioner with bearings, shims and hardware to be mounted to the top of the top deck. A LiPo battery holder in carbon helps keep the LiPo battery in place even during heavy crashes and it is used in combination with the original nylon parts to guide the glass tape through. Finally there is new lightweight machined aluminium steering shafts with hard anodizing, to replace the standard steel ones giving a weight saving of 70%.