no problem and the .25 and .50 markings were very accurate (I used reliable syringes to make sure the markings on the glass are correct). The rubber part looks cheap but not cheap or flimsy like regular bottle droppers, it's on the thicker side and should last quite a while in my opinion. Now that I've seen it in person I'm planning to buy another one, it's a lot easier to take the right amount of my cbd oils with this medical grade dropper than with the unreliable, unlabeled bottle droppers that give you a different amount each time seem to give!
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