Black metal variable-height desktop. Most people use one of these on top of an existing desk, in order to raise the surface to a good height for standing while working. This one is in perfect shape and is easy to raise and lower. In the photos, I'm showing it with my laptop and secondary screen, so you can see how that works. Check it out at varidesk.com. I think it's the Varidesk Essential 36, priced new at $350.