Keep your bottles sealed and secure with the replacement stopper set. Made from PE material, these stoppers provide excellent visibility and performance. They are versatile and can be used with different types of bottles. Features -Color:Transparent -Material:PE -Size:1.60X1.15X1.15cm/0.63X0.45X0.45in -Note: fit for mouth diameter ranging from 0.47~0.55 inches -The bottle stoppers are suitable for various bottle mouths, meeting your different needs. -Versatile design suitable for use as replacement stoppers for laboratory bottles, . -Convenient and simple, the end caps for easy to use, perfect for use in a wide range of bottle sizes. - visibility and performance due to the PE material used in the construction of the bottle stoppers. -The end caps are convenient to handle and store, easy to use and store, perfect for long-term use in pot and bottle, pipelines. Package list: Hole Plugs