I bought a 7 in white and it fits perfectly. 1) PXC 550, 2) QC 20, 3) QC 35, 4) MM 550 (just so ugly)Carrying case - The semi-hard carrying case on the QC 35 is much better than the PXC 550 and seems like it will protect the headphones better. The rack holds up fine until you move it. Nice lines. I bought this and the problem was solved. Buy small. But they fit as expected and good house slippers. I could still hear dispatch so I can trust these for challenged hearing situations. ***Update*** - After almost 2 week trial period, verdict is the same - waste of money. I basically can either hear the hum of my computer and external hard drive (ANC off), or the hum of white noise (ANC on).