These stainless steel roller ball inserts are specifically designed for 16-tooth essential oil bottles, offering a seamless and leak-proof application. Ideal for both beginners and experienced users, these inserts make it easy to create and apply your own essential oil blends. The durable stainless steel ensures a smooth and consistent application, making your aromatherapy sessions more enjoyable and effective. Features -Color:Multi -Material:Pp,stainless steel -Size:2.10X1.20X1.20cm/0.83X0.47X0.47in -Universal application: good for use in homes, offices, and spas, these roller ball inserts offer versatility and can be reused multiple times. -Smooth dispensing: the roller ball ensures a smooth and even flow of oil, providing better control over the oil amount and preventing leaks. -Quick installation: simply insert the roller into the bottle neck, push it flat, screw the cap on, and tighten. the installation is quick and easy. -Leakresistant design: these essential oil rollers snap securely into the bottle, preventing leaks and allowing for easy removal and reuse as needed. -Instant transformation: our roller top inserts can quickly convert your spray oil bottle into a rollon applicator, ideal for thicker oils, diluted oils, or rolling oils Package list: 20pcs essential oil bottle roller ball