Upgrade your essential oil roller bottles with these 16-tooth transparent roller balls. The clear PE plastic construction ensures that your oils are visible and easy to apply. Simply insert the roller ball into the bottle's neck, and enjoy a smooth, leak-free application. With 30 pieces in each pack, you'll always have a replacement ready when you need it. Features -Color:Transparent -Material:Steel, Plastic -Size:2.10X1.00X1.00cm/0.83X0.39X0.39in -Easy portability: these small and lightweight roller ball bottles are designed for easy carrying, making them Suit for travel and everyday use -Versatile storage: ideal for essential oils, lip oils, perfumes, and other liquids, these bottles provide a versatile storage solution -Efficient roller design: the 16tooth transparent roller ball ensures a smooth and even application, enhancing the overall user experience -construction: made from pe plastic, these bottles are transparent, safe, ensuring durability and reliability -Adaptable usage: suitable for various settings including home, travel, and office, these roller ball bottles cater to different needs and scenarios Package list: 150 x roller bottles