Compact 10ml size of these Empty Rollerball Bottles for Oil fits easily in purses, gym bags, or travel kits, making on-the-go application convenient. Thickened amber glass bodies and sturdy PE black caps of these Oil Roller Bottles enhance durability, reducing breakage risks and supporting repeated refills. Empty Glass Roller Bottles feature precision-fitted steel ball rollers that ensure smooth, even liquid distribution without leaks during use. Amber glass of these Refillable Roller Ball Applicators helps protect light-sensitive liquids from UV damage, preserving their quality over time. Each set of Rollerball Bottles comes with complimentary funnel, dropper, and opener, simplifying the process of refilling oils, perfumes, and other liquids.