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4, 8, 16 oz. Boston Round Bottles
These reducers fit extremely tightly into the glass bottles I purchased. At first they seemed too big, but with a little pressure they slipped in and fit VERY tightly. They were a bit of a pain to get back out, but all that means is that it is a tight fit with no leakage or slippage.
These are great, although the aluminum caps dont fit all that well on the 4oz bottles. This was my first purchase and next time I know.