These are brand new, never mounted OEM Liquid Black Physical Vapor Deposition (PVD) wheels, set of 4. PVD is similar to the chroming process but much more durable, used by BMW over the past few years and other manufacturers ie the new Ford F150s.
18x8.5", 5x120, 46 offset, OE part number 677224314.
These sat in heated storage for a couple years after I sold my E90. I hung onto them thinking I'd put them on something else but I've decided I need an SUV at this point, probably going to buy a Suburban or similar. Hopefully someone else can enjoy these.
In the Cleveland, OH area.