These essential oil bottle stoppers are designed to fit seamlessly into threaded bottles, providing a secure and airtight seal. made of transparent material, they allow the contents remain fresh and uncontaminated. Ideal for aromatherapy enthusiasts, these stoppers are ideal for preserving the quality of your essential oils. Features -Color:Transparent -Material:Rubber -Size:1.50X1.50X0.80cm/0.59X0.59X0.31in -Leakproof design: the reusable stopper allows no essential oil leakage, keeping the bottle's interior dry and preventing oil evaporation -Clear stopper: the transparent stopper design allows you to see the remaining oil clearly, making it easy to refill in time -Threaded screw cap: the threaded screw cap tightly seals the bottle, effectively preventing air from entering and maintaining the purity and aroma of the essential oil -Easy to tighten: the screw cap design is easy to tighten and not prone to loosening, allowing the bottle's sealing performance and preventing oil spillage -Versatile use: suitable for various settings such as home, office, and spa, allowing you to enjoy the aroma and benefits of essential oils anytime Package list: 100 x essential oil bottle plugs