These 16-tooth transparent roller balls are compatible with a wide range of essential oil bottles, making them a versatile addition to your collection. The PE plastic material is both durable and lightweight, ensuring that your oils are dispensed smoothly. With 30 pieces in each pack, you'll have plenty of replacements on hand for all your roller bottle needs. Features -Color:Transparent -Material:Steel, Plastic -Size:2.10X1.00X1.00cm/0.83X0.39X0.39in -Portable design: the compact and lightweight nature of these roller ball bottles makes them easy to carry, Suit for travel and everyday use -Versatile functionality: these bottles are ideal for storing essential oils, lip oils, perfumes, and other liquids, catering to various needs -Smooth rolling action: featuring a 16tooth transparent roller ball, these bottles provide a smooth and even application, enhancing user comfort -Reliable material: constructed from pe plastic, these roller ball bottles are transparent, safe -Suitable for multiple environments: these bottles are Suit for use at home, during travel, or in the office, meeting diverse requirements Package list: 90 x roller bottles