Designed for 16-tooth essential oil bottles, our stainless steel roller ball inserts offer a convenient and efficient way to apply your oils. These inserts are easy to use and provide a smooth, leak-proof application, making them ideal for creating custom blends. The durable stainless steel construction ensures performance, allowing you to enjoy the benefits of essential oils without any hassle. Features -Color:Multi -Material:Pp,stainless steel -Size:2.10X1.20X1.20cm/0.83X0.47X0.47in -Wide range of use: these stainless steel roller ball inserts are good for use in homes, offices, and spa settings, offering versatility and reusability -Smooth and even flow: the roller ball ensures smooth and even oil distribution, providing better control over the oil amount and preventing any leakage -Simple and quick assembly: just insert the roller into the bottle neck, push it flat, screw the cap on, and tighten. the installation process is quick and easy -Leakresistant mechanism: designed to securely into essential oil bottles, these rollers prevent leaks and can be easily removed and reused as needed -Instant conversion capability: our roller top inserts can quickly turn your spray oil bottle into a rollon applicator, making them good for thicker oils, diluted oils, or rolling oils Package list: 20pcs essential oil bottle roller ball