First things first, I checked to make sure these didn’t leak. As soon as I got them, I filled with water and dumped them upside down and rolled them around on the back of my hand. Mine didn’t leak. I like the little gadget they included to pop the rollers on and off. For some reason I thought the lids would be real wood, they’re not, they’re thin cheapy plastic. The lids on my screwed on right. I’m going to fill these with perfume for traveling and one with castor oil (I use it like chapstick) to keep in my purse so I was going to return these if they leaked. They didn’t come with instructions so I checked the Customer Questions section to see how to clean or sterilize. Since some parts are plastic I didn’t want to boil like I normally would glass bottles. Someone said they washed with soap and water then isopropyl alcohol and let them air dry. That’s what I did too. I don’t want mold or anything yucky growing just in case. Overall I’m satisfied with these, I just wish the lids were real wood or at least thicker plastic.Made purchase to replace my large coconut oil pump I keep next to my bed. After shooting oil everywhere at night, i found these. I don’t need a life time little bottles supply, but it was the better value.When I got them my son was home from college, so i filled up a couple for him to take back. While reluctant, by the time i was done selling him, he was happy to take.Labels are great! They don’t slide off if i get oil on them and I can confidently keep track of what i’m rolling on my face as opposed to my feet ?I had been researching different roll on bottles for some time as I kept reading complaints about the roller balls. These ones had the best reviews for the price so I made the purchase. I am very happy so far as the roller works perfectly and so far no leaks as well.Great, affordable bottles. All pieces were included and they were packaged well. I’d buy again.These are perfect for perfume oils! I love them!Love these little rollers will buy more in different colorsDirections are clear and the pieces to reopen the bottles to refill fit perfectly. The rollerballs have all worked on the 5 that I have used so far. Pleased that it came with the labels. I am very happy with my purchase.I bought these to use for my natural fragrance line for my small business. They work wonderfully. They come everything you need (not the labels, those are my own). I've bought several boxes of these and have not had any issues. They are well-packaged and worth the money.Me parecieron de buena calidad y de buen precio