Precision CNC milled from aircraft grade aluminum to 1/1000ths of an inch tolerance There's some marketing hype there, I think 0.001" precision is standard for

Precision CNC milled from aircraft grade aluminum to 1/1000ths of an inch tolerance There's some marketing hype there, I think 0.001" precision is standard for CNC machining with aluminum. All it's effectively saying is that the product is CNC-machined aluminum. Having said that, a CNC-machined aluminum enclosure is really great (as any MacBook owner can tell you) and it is more expensive to produce than injection moulded plastic. In terms of machining precision on its own, relatively impressive precision would be somewhere around 0.0001" (one ten-thousands of inch) precision. But that would be complete overkill for this kind of product. Apple is one of the world's largest (if not the largest) users of CNC machining. There are some great write-ups online about this that I can't find right now.