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2 little metal plate to suport them broke alraedy, not make to suffert vibration of HD
Chromed plastic but they look great and sound even better. The only real complaint is there is no wiring diagram. Be very careful of the diagram on the relay it shows one normally open and one normally closed set of contacts but the closed contacts are really the contactor. Other than that, they were easy to mount and wire and LOUD!!! which is what really counts here after all. Not mention very affordable.