Pencil-thin is so last year. This gold brick is now slightly thinner than a pencil.
In all seriousness, the 6.1 mm profile is impressive. Not only is the iPad Air 2 thinner than the original iPad Air, it's even thinner than the latest iPhones—and lacks the latter's controversial camera bump.
Not only is this iPad Air 2 thinner, but it is lighter too. How much lighter? About 12 pennies worth.