These items are made of high quality aluminum which adds color to the interior. They come with no instructions - it's not that hard to figure out how to install them! But they don't have a way to secure them in place, nor written instructions making suggestions about how to do it. Luckily for me, mine only stay relatively securely in place due to their tight fit. I didn't use glue and didn't have to "line" the inside of the ring with some kind of tape to reduce the inside diameter and make it tighter. All in all a good purchase that I would recommend.
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