15ML Blue Dropper Bottle with 18MM PP Knurling Dropper (Black) - Featuring a high-quality glass tube and a durable silicon black rubber teat with a wiper plug. This dropper bottle is designed for precise and controlled dispensing of essential oils, serums, and other liquid formulations. The knurling dropper design ensures a secure grip and effortless handling, making it ideal for both personal and professional use.