lids do not fit when roller is in paid full price [SEP] the lids do not fit right on any of the vials i have not really used any of them because of that but i did but plain olive oil in three of them just to see if the leaked or not and one of the three did leak oil the other two did not i left the oil in there for about minutes and laid them on their sides which is not a real real leakage test because in real usage they would not be lying still they would be getting jostled around at least a little but with the lids not fitting properly i have no intention of using them for much if at all so i did not bother with further testing next time i will definitely look for a different company to buy this type of bottle