If you are looking for Roller Ball Inserts with stable and reasonable molding, I will tell you that our Roller Ball Inserts will be your ideal choice. It adopts Steel, Plastic material, can keep it for longtime. The roller ball is allowing for a seamless and effortless application of essential oils and perfumes. Features -Color:Assorted Color -Material:Steel,Plastic -Size:2.10X1.00X1.00cm/0.83X0.39X0.39in -Bottom diameter: 9.85mm - Adopting from good material, which is lightweight, with and fine workmanship. -Equipped with a smooth for comfortable and easy application of the lip gloss or perfume. -Comes with enough accessories to last for a while, ensuring a long-lasting usage. -Easy to install and replace, providing convenience for all users. A refillable roller ball applicator for essential oils and perfumesh. - Snap these roller ball tops into your essential oil bottles for a leakproof and secure fit. Package list: 10 x roller bottle accessories