While bandmommy is correct in theory...it COULD depend on the mouthpiece. Metal mouthpieces are sometimes much smaller in circumference than their hard rubber counterparts. If it fits though...there's no reason that it shouldn't work.
It's simply about sizing. Rovners are made in various sizes for different dimensions of mouthpiece. And since metal mouthpieces are generally made with smaller external dimensions than hard rubber ones, "metal" and "hard rubber" – when used in the context of ligature sizes – simply refer to what size of mouthpiece they should fit best.
For instance: The Rovner I used on my HR Berg does not fit my metal Deep-V, as the hard rubber Berg is externally larger than the metal Deep-V. However, I'm sure that there are some metal mouthpieces out there that have large enough dimensions to warrant the use of a ligature that's "hard rubber-sized."
Try putting a reed and your lig on the metal mouthpiece, and tighten the lig like you would normally do. If it's loose – even if you tighten the lig all the way – then you need a smaller ligature. If it fits correctly, then you lucked out!
Yeah, I second Bruce Bailey's comment. I've heard of sax players successfully using soprano Rovners on metal alto mouthpieces, and alto Rovners on metal tenor mouthpieces. In fact, I am planning to use my soprano Rovner on the Beechler Bellite 7 alto mouthpiece I just ordered (when the dreadfully long 3 month back order wait period is over), as apparently this mouthpiece doesn't come with a ligature.
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