This brown high-temp rotor has a special "heat sink" ring tang on it to absorb and dissipate the extra heat.
The tang is epoxied in place so it can't come off. This assembly includes the screw-down base and the nylon retention screws on the side to prevent wear between the two plastic parts.
Racer must choose from drop down menu, Left-hand (CCW) rotation or Right-hand (CW) rotation when purchasing.