RC crawler enthusiasts, this one's for you. If you're running a Traxxas TRX-4 1/10 scale crawler, you know how important low-center gravity is for tackling rough terrain without tipping over. These brass counterweights are a sweet upgrade. You get two in the pack, each weighing 86 grams (so 172 grams total), made from solid brass via precision CNC machining for a clean look and durability. They have an outer diameter of 50mm and an inner of 40mm, designed to mount on the axle or bridge area. The extra weight down low dramatically improves side-hill stability and overall balance, giving your rig way more traction and confidence on steep inclines and rocky trails. They come with 4 screws for easy installation. Made from quality brass, they're tough, wear-resistant, and add a cool golden accent to your build. A simple mod that makes a huge difference in performance.