
I contacted the seller about the roller's metal balls falling out during use and he responded with advice on which oils are causing this (virtually all EO's). I'm copying her answer so you can decide if you want to spend your money and time on these roll-on bottles to be used with essential oils, but ONLY a select few. *** This is her exact answer: Thank you for your purchase. All mixtures must be tested. Some oils like clove, black pepper, myrrh, peppermint, tea tree, lavender, citrus, or frankincense can dissolve synthetics. (The body that holds the balls is plastic) And very lubricating carrier oils like fractionated coconut oil cause the roller to become lubricated enough to make it slip out of the body. (This is only a partial list; this applies to all roll-on bottles, not just miniature bottles). Essential oils are effective because they have chemical properties. These are the same properties that cause chemical reactions with certain other ingredients/materials. == Did this solve your problem? *** This is the end of her answer *** No, that did NOT solve my problem. Rollerballs are still failing and this information should be shared with anyone who purchases these products. ** Roll-On Bottles can only be used for certain Essential Oils!

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