Are you looking for a practical plug for your experiment? Do you want a reliable test tube plug? If your answer is yes, please come and take a look at this product. This test tube plug set is made of high-quality material, which has the long service life. It will meet your experiment sealing needs. Features - Color: As Shown. - Material: Rubber. - Size: 3.00X2.30X1.80cm/ 1.18X0.90X0.71in. - Perfect for chemical industry, medicine and other scientific researches use. The practical rubber stoppers, easy to pull and remove, save time and labor. - Made of food grade rubber material, durable and safe to use, you can use them trustingly. - It can be used with the glass tube. It is a necessary opening rubber plug kit for experiments. - Not only suitable for professional research institutions, but also suitable for individual containers that need to be sealed. - Small and compact, easy to store and use, not taking up any space of home or laboratory.