I am very happy with these bottles so far. I really just wanted the roller and cap to fit the Black Phoenix Alchemy Lap perfume oil bottles which come in bottles that look like the one pictured. Rollers make application much easier, and I'm more inclined to carry oils when I can apply them without fear of spills. The vials come pre-assembled, so don't worry if you need to remove the insert from the vials. They weren't so tight that I couldn't pull them out with my hands, but they didn't hang out either. The bottles I transferred the rollerballs into are also 5ml amber bottles, very similar to the one in the photo, although not exactly the same. Luckily, the pouches fit securely in my bottles with no issues and feel secure. To test how well the rollerball inserts fit, I took a bottle of perfume oil that I didn't need, placed one of the rollerballs in the bottle and screwed on a new cap. I placed the bottle in a ziplock bag and then turned it so the top of the bottle was facing down at about a 90 degree angle. I left it there for over 24 hours and didn't notice any leak. After that I shook the bottle for a few minutes and removed the cap. There was no sign of oil leakage from the neck or bullet. My next test would be to take it on a plane to see how it handles pressure changes, but I won't be flying for a few months so I can't confirm how well these bottles perform in a real world travel situation. Buying these bottles to fill with your own oils seems like a quality option. The bottles are a lovely dark amber color (as pictured) and I believe the rollerball pens are glass. I didn't remove the balls from the plastic liner, but I banged them together a few times and they sounded like glass to me. The lids look good too. They have a little barrel shape inside that falls down and rests on top of the rollerball ball - so it doesn't roll or leak oil I assume? I did quite a bit of research before deciding to order them for the first time and have now re-ordered twice and bought the latest items from this seller. I really hope they get more because I have a few dozen more bottles I want to add roller tops to.
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