I bought these to decant perfume oils for personal use. The bottles work well, the dropper inserts are functional. Some of the inserts leak very easily, which may be related to the thickness of the perfume oil, but none of the caps leak. My biggest complaint is that the vials are not 1ml but 1.5ml. That's fine with me as they are for personal use but if you buy them for measured samples or a decent circle see yours Bottles half empty when you only fill them with 1ml.
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