I purchased these some time ago and have used 4 out of the 6 received. The other 2 are fine, I just haven't had a use for them yet. I purchased these for another reason, but ended up with Bursitis in my knee and wanted to use essential oils for it so instead of putting the oils drop by drop, I decided to mix them up in the roller bottle and see how that would work. The roller ball casing snaps in the bottle just fine and the oil rolls smoothly on my knee or any place else I want to use it. I also have weak hands and removing the roller ball and putting it back on is very easy for me. Boiling it would just be a waste of time. I think I have refilled 2 of the bottles a dozen times and the other 2 multiple times. I pry up the roller ball casing with a metal nail file, a thick one, and when the bottle is filled I set the roller ball casing in the bottle and push it down with the palm of my hand. I carry one in my purse, one in a bag that I carry from my bedroom to my desk, and I have one lying down on my bedside table. I haven't had any leakage from these bottles. They have been working great.

Just like the lip gloss sticks back on our day, these are great for carrier oil mixtures for skin application. I bought the Roll On Bottles, and I read some reviews. I noticed there was a common complaint of not being able to put on the plastic roller-ball top securely/all the way on the bottle.
I did not have to boil the tops to attach them to the bottles like was hinted in the reviews, but decided to experiment in getting them topped myself. I felt boiling the plastic tops before cramming them in the tops of the bottles would be too time consuming.
Once I filled the bottles, I used a smidge amount of the oils I used to fill the bottles to smear thinly around the outside of the plastic part that would push into the bottle (in a sense, a thin oil barrier between the plastic and the glass).
The top popped in and worked perfectly! I had to push semi-hard, but the top slipped into the easily enough, while being in there tight enough where it wouldn't slip out or leak.
I have filled four of the bottles so far. Some of them tipped onto its side and there has been no leaking, the screw on black caps fit tightly. The roller ball only needed to be primed at first use, and has been able to be applied evenly and thinly. The more you roll over the same spot, the more oils are applied to your skin, so you can apply a very thin layer, or make it a little thicker by rolling it on longer in multiple layers.
I have easily been able to remove the top to refill. I would definitely purchase more of these as my friends are now wanting my roller ball recipes for stress relief!

No Return/No Refund That is the mark of a company with no confidence in its product. And for good reason in this case. Based on the good reviews that seemed to solve the bad reviewers' problems, I bought the items. I followed the correct procedures for filling them based on the good reviewers' advice. The roller ball allowed far too much oil to pass through leading to generous amounts of oil rather than sufficient amounts to be poured onto target areas. Sacred Frankincense. Not, I grant you, the most expensive oil out there, but for a woman on a limited budget, it'll do. I put my trust in these bottles, and the roller ball popped out after 1 week's gentle (for fear of overabundant) use. Something like $20 worth of oil was lost .... although my living room smelled piney and, oh, vaguely soapy, for a while. So I looked into returning the bottles right away. No refunds, no replacements, no returns. The mark of a company that has no confidence in its product. Now if THAT were evident on the product page, I think we know how much product this shoddy company would move.

First bad review of a product I've written. I always carefully sterilize bottles before using. These were painted! The bottles were in the scalding water for only a moment when I noticed flakes of something floating in the water. Paint was peeling off the bottle, revealing clear glass. I'm stunned. Product description should say "Frosted Paint on Clear Bottles". Perhaps it was just this batch, because I have not seen any complaint for defective bottles in all the reviews. I contacted Amazon, and they credited a refund immediately.

Loved these works very well with oils. I have seen reviews saying that the paint peels off, I did NOT find that to be true with the*Frosted Blue roll on bottle" but when I ordered again I accidentally ordered "(Blue) Roll-On Refillable Glass Perfume Bottle Purse or Travel Size" thinking they were the same. They are not.

The bottles I am reviewing *Frosted Blue Roll on Bottle" are the ones on the left in my picture. The ones on the right are clear glass painted blue. Be careful when you are ordering.