SilverStone SST-Aeroslots-BP - Vented PCI Slot Cover Plate, 4 Pack, black

Slightly on the thin side so that when some drives or fans vibrate the case they can rattle, but with a good tighten they staycheap and there is plenty meaning you shouldn't have a problem filling up your pci slots if you didn't have spares in your case

These are very thin, flimsy pieces of lightweight metal and not as robust as I was expecting for the cost. If your slots are a bit tight, these covers will bend very easily whilst you try to insert them.