This is an optional custom Titanium Hinge Pin Kit, and is intended to upgrade the stock pins for the TLR Losi 8ight 4.0 1/8 scale buggies & Truggy. these hinge pins are machined from precision ground 6AL/4V titanium stock and polished to a fine finish. Racers stand to gain the most performance from weight reduction up to 45%, and these hinge pins are another option to add a racing edge to your favorite car or truck.