The best I have found by far!
These are hands down the best dropper tops I have found to date and don’t plan to look elsewhere. I will purchase these and only these from now on. They fit beautifully (if it appears the glass dropper doesn’t fit just gently push the glass down from the dropper end) and the seal is fantastic. I’ve not noticed any leaking or evaporation at all so far. Tried other retailer versions and what a mess and waste of money. These are excellent!