These bottles are fantastic. They are 4oz so they work perfect for me for storing hair oil that I sell. The dropper is measured so you can put the perfect amount that you need every single time you use the dropper. They are glass bottles. The dropper screws onto the glass bottle with a nice a secure closure. They don’t leak when you hold the bottle upside down which is also a huge plus. They don’t feel or look cheap and flimsy at all. They came packaged very well with no broken bottles at all. I would highly recommend these.