“Selected and customised” by Jony Ive and Marc Newson (the duo also behind the special edition Leica M camera).
From the description:
The new Mac Pro is the most powerful, yet radical Mac that Apple has ever designed. Architected around an innovative, unified thermal core, the new Mac Pro features dual workstation graphics cards, the latest Xeon processors, ultra-fast flash storage, and incredibly high performance I/O. A precisely machined and polished enclosure houses this advanced technology in an extraordinary design that stands just 9.9 inches tall and 6.6 inches in diameter. This one-of-a-kind model, made with red anodised aluminium, has been crafted exclusively for the (RED) Auction.