FullSix carbon fiber Monocoque Tail sections are structural components used in professional racing to reduce weight. A replacement for stock aluminum subframes, Fullsix monocoque tail sections utilize its' proprietary Autoclave Composite Monocoque (ACM) technology to achieve a 75% weight reduction! A FullSix carbon fiber monocoque tail section weighs only 1.6 kg (3.5 lbs) compared to 6.5 kg (14.3 lbs) for a stock aluminum subframe.