I love the cobalt blue color and was excited to use these to test and store small mixes of essential oils. They are the perfect size to sample an EO mix and share with others.The drams work well and so far those I have used have not leaked, however, three of the drams were completely shattered upon arrival due to inefficent packaging, so if you need exactly 30, please keep this in mind. If you plan on refilling, you should invest in a removal tool, which can be used on any bottles, rollers, etc.
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https://www.amazon.com/Essential-Chemistry-Chemicals-Colognes-Perfumes-3/dp/B078363HTL