I purchased these from simplenatural on eBay, and wasn’t sure whether or not I was going to be able to do what I wanted to do with these. I am just starting to experiment with DIY beauty and health products, and I wanted my first project to be lip balm. Both my husband and I use lip balm, neither of us drink enough water, and therefore our lips are often dry. So I found a good recipe but needed to put it in something, so I searched for lip balm tubes, and this one seemed to be the best price. I am completely happy with these. I made my first batch last night, and every lid fit every tube perfectly. None of the tubes leaked, and the mechanism that turns to push the balm up works flawlessly on each. I will definitely buy these again (although it will be awhile before I use all these…50 is a lot for the amateur!