Design and build quality
The AKG K512 look pretty decent and they're made primarily of plastic. The structure of the headband and the frame is slightly different from other headphones, though. For example, the flat headband on the top slides out, so it fits your head properly. Most other headphones use a rigid design, but this one moves independent of the two plastic covered bands that hold the two cans of the headphones in place. All of this is perfectly set up. Overall, the headphones feel light but a little flimsy. The compartments that hold the drivers are also made of plastic - the AKG K512 are closed headphones with no openings on the rear. The earpads are made of a synthentic material, so they don't feel very comfortable. In humid places, you're likely to get sweaty ears after using it for an hour or two.
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