Some of the models have copper, some have black colored wires on the coil.
The cover conceals this mess very nicely.
Before you experts make a comment about the length of the blue and green wires, I know, they are too long.
I was concerned about the state of the wires coming out of the coil and left the wires full length while I tested it.
It fits perfectly under the lok cover, but, I do intend to make it a proper length.