This is an optional Tekno RC ET48 Aluminum Rear Center Driveshaft.
This product was added to our catalog on May 20, 2014
Wednesday, Sep 26 2018 (about a year ago)
Tekno RC ET48 Aluminum Rear Center Driveshaft
Nice upgrade over the stock heavy steel shaft that comes with the ET48.3 kit. Not sure why it's not included when they already include the front one in aluminum. Either way, it's one of those must have parts to get when ordering the kit.