RC enthusiasts, here's a solid upgrade for your LOSI 1:4 scale Promoto-MX motorcycle! This is a set of two brake caliper servo arms. They replace the stock plastic parts with much stronger ones made from aircraft-grade Aluminum 7075-T6. This material is way more durable and wear-resistant, which is crucial for the part that controls your brakes. Upgrading to these metal arms will improve your brake response and consistency, especially during intense riding, jumps, and hard landings. It helps ensure your bike can handle rough terrain without the servo arm flexing or failing. The set includes 2 servo arms (one for each side, presumably). They have a 20-tooth spline. The original LOSI part numbers these replace are LOS261013 and LOS262009. They're specifically for the LOSI 1/4 Promoto-MX Motorcycle RTR models: the FXR (LOS06000) and the Pro Circuit version (LOS06002). If you're looking to make your RC bike more reliable and performance-oriented, this is a key upgrade. They come in a slick black finish. Install them and feel the difference in your braking control!