Description Enhance your essential oil experience with our 16mm diameter roller ball inserts, designed specifically for 10ml essential oil bottles. These stainless steel roller balls ensure a smooth and even application of your favorite essential oils. for on-the-go use, simply insert the roller ball into your essential oil bottle , precise application every time. Features -Color:Pink -Material:Jade -Size:2.00X1.10X1.10cm/0.79X0.43X0.43in -Compatibility: designed to fit 16 mm neck 10 ml essential oil bottles , ensuring a seamless replacement and easy portability -Even application: provides an even distribution of essential oils, enhancing the user experience with smooth and consistent application -Leakproof: the cap offers excellent sealing, preventing essential oil leakage and maintaining the freshness and purity of the oils -Durable material: made from robust materials that resist breakage, these roller balls are reusable -Easy to use: simple to operate and cleanPackage list: 4pcs essential oil bottle accessories