In traditional distributor-based ignition systems, the rotor arm spins inside the distributor cap, directing the high-voltage spark from the ignition coil to the correct spark plug terminal at the precise moment. A worn or cracked rotor can cause misfires, rough running, or complete ignition failure. We supply rotor arms made from conductive, durable materials with precise brass contacts. Our rotors ensure a strong, consistent electrical connection, delivering the spark accurately to each cylinder in the correct firing order for reliable engine operation in classic and older vehicle ignition systems.