Tubas, euphoniums, mouthpieces, and anything music-related.
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My guess is it's not much different from the 30G other than the larger diameter.
If you really want bigger than the G cup, the B cup is the same shape, but deeper. Yes, there's a 32B.
I myself find no need to go bigger than the 30 size rim. I also really like the 30G; it's what I use on my 2103. Thick, clear, rich (adjectives describing this suck) sound depending on my shaping of the notes, without fatigue for a 2 hour set.
Even if I'm by myself in a 70-piece band, I haven't found myself needing a 30B yet.
F Schmidt 2103 BBb, Laskey 30G US
Wessex TE360P Bombino Eb, Denis Wick Heritage 4L
JP274MKII Euphonium, Tucci RT-7C
Various slide things