This is the Traxxas Slipper Clutch Set for Traxxas Vehicles which Do Not Currently Have the Slipper Clutch Set or Need the Current Slipper Replaced. Works with the EMAXX versions also FEATURES: Allows the slipper to slip under stress instead of the diff gears stripping. Better traction control Adjustable tension YOU WILL RECEIVE: One 84 tooth spur One 87 tooth spur Two metal diff slipper diff rings Two metal diff slipper plates One rubber stopper for diff cover (allows cust to pop the plug out to make adjustments to the slipper instead of the entire diff cover One slipper adjusting spring One slipper tension spring Two white nylon spacers Twelve slipper pegs REQUIREMENTS: Glue to glue the slipper rings to the slipper plates. (Traxxas suggests super glue) COMMENTS: This is a good hop-up for Traxxas vehicles which currently don t have a slipper unit on them.