This is an optional Losi 4x21mm Titanium Hinge Pin Set, and is intended for use with the Losi 8IGHT family of vehicles. These titanium hinge pins offer a 3.5g weight savings (1/8oz) compared to the stock steel components.
By using all of the following titanium parts, the 8IGHT 2.0 and 8IGHT-T 2.0 can have a weight savings of 42% over the steel components!