Very cool scale upgrade to the Traxxas Slash 2wd/4x4. It allows you to use 4, 5mm sized LEDs up front. Suitable for night time driving. You do need the RPM bumper with this though it will not mount to the stock Traxxas one. The manual also tells you to glue in the lenses, make sure you use a clear silicone based glue and not a CA glue because the CA will fog the lenses.