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I do not have stainless or brass, but I have a Gaboon Ebony Titanium from John Sinclair. Killer sound……
I am a big metal pot call fan. I LOVE my John Sinclair brass, I have (3). Love titanium also have 3 of Johns and one other from a another call maker. SS have but have not used much. I too like aluminum surfaces. Everybody else likes glass. I am not a fan of them, have tried different ones and have not found one that "I" like, but maybe the turkey would.