Large hole test tube plugs--it is a good choice as a gift for your at school if they do experiments in laboratory,rubber lab stopper
Rubber stoppers silicone sealing plugs--small and compact, easy to store and use, not taking up any space of home or laboratory,bottle stopper laboratory
Small rubber stoppers--perfect for chemical industry, medicine and other scientific researches use the practical rubber stoppers, easy to pull and remove, save time and labor,stoppers for chemistry containers
Solid test tubes bungs stopper--not only suitable for professional research institutions, but also suitable for individual containers that need to be sealed,bottle stopper
Bottle bung--these rubber flask stoppers are using a suitable shape design, easy to insert and pull,lab plug