Enhance your essential oil experience with our 16-tooth compatible stainless steel roller ball inserts. These durable and reusable inserts are good for DIY essential oil blends, making them a must-have accessory for any essential oil enthusiast. The stainless steel material ensures a smooth application, while the secure fit prevents leaks. the roller ball into your bottle and enjoy a mess-free application. Features -Color:Multi -Material:Pp,stainless steel -Size:2.10X1.20X1.20cm/0.83X0.47X0.47in -Wide application: these stainless steel roller ball inserts are good for use in homes, offices, and spa settings, offering versatility and reusability. -Even dispensing: the roller ball ensures smooth and even oil distribution, providing better control over the oil amount and preventing any leakage. -Simple 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: designed to snap securely into essential oil bottles, these rollers prevent leaks and can be easily removed and reused as needed. -Instant conversion: 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: 4 pcs x 20pcs essential oil bottle roller ball