These versatile bottle stoppers are designed to fit threaded essential oil bottles, providing a seal to keep your oils fresh. The transparent material offers a clear view of the contents, making it easy to identify your oils. ideal for both personal and professional use, these stoppers are a must-have for any essential oil collection. Features -Color:Transparent -Material:Rubber -Size:1.50X1.50X0.80cm/0.59X0.59X0.31in -Leak prevention: designed to prevent essential oil leakage, keeping the bottle's interior dry and preventing oil evaporation -Clear visibility: the transparent stopper allows for easy monitoring of the remaining essential oil, allowing timely refills -Tight seal: the essential oil bottle plug allows a tight seal, preventing air from entering and maintaining the oil's purity and aroma -Easy to use: the screw cap design is easy to tighten and remains secure, allowing the bottle's sealing performance and preventing oil spills -Wide application: suitable for use in homes, offices, and spas, allowing you to enjoy the benefits and aroma of essential oils in various settings Package list: 100 x essential oil bottle plugs