Yep amy is right
I would not reccomend the one you linked (which is called a "Nobby" wheel) If your looking for a silent wheel. I checked all the ones in my local pet store and they were all noisy. I think it's something wrong with the whole range because at the swede forum peeps with that wheel has had to bend it for themselves so they wouldn't make so much noise. I even think I got it cheaper, plastic wheels shouldn't be expensive
But I paid £20 for my 20cm karlie