An excellent grade of rubber. Low sulfur content. Size numbers are molded into the top. Each piece has one hole at the center with diameter of approximately 3mm.
Top Diameter(mm) x Bottom Diameter(mm) x Length(mm).
Note that each size has different pack quantity.
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Perfect - which is a word that we homebrewers do not often say, but this stopper is exactly what I needed to set up a controlled racking system that will be (almost) oxygen free.