They look like they get stuck on by an adhesive ring. I really don't like the thought of doing that with my K550s. I have already bought a replacement pair of ear pads but I paid the price and got the originals.
I go on public transport quite often with my K550s and I feel I would get stared at even more with those huge ugly ear pads!
They may well improve the sound though and a little more impact to the bass would be nice if they help out with that.