Plastic de bonne qualité.

PLMR53 5 25 Inch Two Way Shielded Speakers

I used these on a 2008 Honda civic Si, they work for the front and rear speakers. As mentioned in other reviews the hole on these adapters where it is fastened to the car will need to be bored out so the screw is flush with the top of the plastic or the speakers will not fit properly. I used 6.5 inch speakers in my install so I do not know about 5.5 speakers if it would have to be done also. I used a 1/2 spade bit to bore the hole out. I don't know if this is necessary but I put foam between the adaptor and the metal it sits on because I was installing a sub and did not want to have any vibration issues. In the front door speakers I did have some more extra work that had to be done. On the door panel there is this plastic ring I had to cut off because my speakers were not an exact fit because there is a part of the metal door which I did not feel like cutting and my speakers were not exactly able to sit flush on the adapter. Be careful on the speakers one chooses because you may have issues with the depth in the front and rear of the car. All in all these were what I needed to do the job.

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