The vials in this set were not all standardly manufactured. Some leaked. Others were almost impossible to cap. Worst of all, the manufacturing irregularities and micro-flaws in the glass caused SEVERAL to shatter in hand as they were being capped. It was sheer luck that no one ended up with large shards of broken glass wedged deeply into their thumbs (and yes, I recognize it was an extremely dumb move on our part to keep trying to use them after the first one shattered). EXTREMELY DANGEROUS!!!! Anyone attempting to decant should wear heavy duty cut-proof gloves like butcher's gloves... or else go with different vials all together.