This is a dummy brake disc and caliper set that can be used on all YD-2 series vehicles. Brake discs are integrated with the hex hub for wheel mounting and of course rotate with the wheels. Comes with 3 types of hub thicknesses: 0.2 inch (5.5 mm), 0.2 inch (6.5 mm), 0.3 inch (8.0 mm), so you can adjust the tread width and scrub radius. On the other hand, the gun metallic color brake caliper stays on the front and rear knuckles, giving it a realistic look as if you are driving. Brake disc & caliper peeking through the gap of the wheel to pull the foot of the machine. The set also comes with a resin steering block and rear hub carrier, which makes it easy to install the caliper and is shaped to fit the latest setting. The steering block references the actual vehicle structure and sets the best rails and kingpin angles to enhance the look of your counter steering, while also improving steering response. The steering stopper and tie rod mounting position are also modified to the latest specifications, making it smooth when the cutting angle is increased. The rear hub carrier increases the upper arm mounting position and increases the width of the roll center and ground camber changes to enable aggressive roll leverage. In particular, on road surfaces with low grip such as P tiles, the upper arm mounting position is elevated to maintain the ground area when the chassis is rolled, ensuring a stable grip in the side for an aggressive ride.