A good replacement fit for Audio Technica ATH-M50s, pretty close to the original. However, the sound produced by the headphones is pretty terrible.
Prior to these I was trying some Brainwavz HM5 Earpads - the sound quality is dramatically better with the Brainwavz pads! However, they're quite a bit thicker which increases the clamping force of the headphones, which hurts my jaw after about an hour.
I've gone back to the Brainwavz pads because the sound quality is just so much better.