Hi Sub......A guy here at work has a tin of these in his room.......I have had a quick look, and they are the nastiest, cheap, misshapen tat I have seen for years......I picked out a dozen or so, and was hard pressed to find one that was actually round, or had an even thickness skirt
That said, they may be fine for tin banging in the garden or similar, but from a quick look, they really look rough......I may "borrow" a handful to try out later/tomorrow......but I am not expecting any accurate results