I use them in all of my essential oil blends that I make and sell. They are a great price and the perfect size for what I need. I have ordered from Vivaplex about 5 times and the quality has always been very good. The rollers are made of plastic and seal very well. I have never experienced a leak. The bottles are solid, I've dropped a few on the cement floor and never broken. A plastic pipette is completely useless, so I use a glass pipette instead.
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