This is an optional Team Losi Racing Pre-Built Steel 4 Shoe Clutch, and is intended for use with the Losi 8IGHT family of vehicles. The steel flywheel included with this pre-built clutch is heavier than the aluminum flywheel and is recommended as a tuning option for low traction, rough track conditions. The added weight will also help to provide smoother acceleration on engines with aggressive bottom end power delivery, and improve the engines idle characteristics. Includes two aluminum shoes, two carbon shoes, as well as two black, two green, two gold and two silver clutch springs allowing you to tune the clutch for a variety of track conditions.