Our stainless steel roller ball inserts is designed for 16-tooth essential oil bottles, providing a reliable and efficient way to apply your favorite oils. These inserts are easy to install and remove, making them good for creating custom blends. The stainless steel construction ensures durability and a smooth rolling experience, allowing you to enjoy the therapeutic benefits of essential oils with ease. Features -Color:Multi -Material:Pp,stainless steel -Size:2.10X1.20X1.20cm/0.83X0.47X0.47in -Multifunctional: ideal for use in various environments such as homes, offices, and spas, these roller ball inserts are highly versatile and reusable -Consistent flow: the roller ball glides effortlessly, ensuring an even distribution of oil and better control over the oil amount, with of leakage -Effortless installation: insert the roller into the bottle neck, push it flat, screw the cap on, and tighten. the installation is straightforward and easy -Leakproof mechanism: these essential oil rollers securely into the bottle, preventing leaks and allowing for easy removal and reuse as needed -Versatile inserts: our roller top inserts can instantly convert your spray oil bottle into a rollon applicator, suitable for thicker oils, diluted oils, or rolling oils Package list: 2 pcs x 20pcs essential oil bottle roller ball