The top and bottom that go over the internal machine which drives the device, made of plastic, and the color is a graphite-black.

We sell over 100 different used parts. If you want to figure out what is wrong with your chair, and how to fix it, buy our twenty minute diagnosis via email, text, video or call for $20.00, purchase at this link, https://www.ebay.com/itm/255193158645

If you are in Florida we might be able to come to your location and repair your chair for you, if you are interested please ask us for a quote, so we can let you know how much it will cost.

Please let us know if you have any questions.

These are pre-owned, they show wear, there are gouges, nicks, scratches, scuffs that may need touch up paint, but they still lock together and is ready to be put to work on your chair.

This is for one top and bottom that cover the tilt. This fits the size A, B and C  chair and are genuine OEM pieces for the Aeron office furniture line by Herman Miller.

If you want multiple parts we can combine shipping.