hmmm, a bit of a con, this - and that's not thomann's fault, more a bit cheeky on the part of H&B.
it's a bucket mute, i love them, love the sound, love the feel of using them, love getting one out on a gig for a solo and turning the whole thing around. where the con lies is in the description of the mute, saying it's made to accommodate a larger 5" trumpet bell, since most trumpet bells are 4", 4 and a bit. i've just bought a new carol brass trumpet (i can't even begin to tell you how much i love it, the more i play it the more i love it, thank you thomann so much for all your hard work putting up with me and getting it for me) and it's got a 5" bell and my old mute just didn't fit, so i bought this one, specifically designed for a bigger bell....
when it arrived it's a wonder you couldn't hear me laughing: it's exactly the same as the old mute but the clips are pushed further apart so it goes on the bell easier - it's not a 5" mute, it's a 4" mute with wider clips. hmmm.
buyer beware, descriptions can be misleading. yes it fits a 5" bell which my older one didn't, but only because the clips are wider, i could've stretched the clips on my old one and saved £30.
like i said, this isn't thomann's fault, but it's a bit of a con from H&B. meanies.