I am not a bartender or an expert. I use them at home and I don't mind if they don't pour exactly 1 ounce if it's a bit tight. I didn't measure the filling so they might be perfect. I put them on most of my liquor bottles. They go very well with many of them. Some bottles have a hole too big for the spouts to fit snugly, so I can't use them for multiple bottles. If I could change something, I would like the spouts to fit a wider opening. Otherwise they are great for my purposes.
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