Blisstime Glass Roller Bottles with Metal Ball for Perfumes Cosmetics 5ml Set of 6 Smooth rolling metal ball for easy even oil application, no more rollers getting stuck or falling out Protect your expensive oils and perfumes from light and UV damage 90% or more quality carrier oil dilutions recommended Tight fitting lid to stop those annoying leaks.Come with 12 rolling metal ball,allow you have 6 mental ball on standby. Take your oils wherever you go with this travel size (5ml, 0.17 fl oz) portable product.