What will you receive: the package contains 30 test tubes and 30 natural corks, the volume is 30 ml, the placement of a label with a name or text in the test tube is a great way to prepare your loved ones or friends perfectly . It can be used as a souvenir with different fillings, gifts, etc., depending on the preferences of the guests. And they don't break easily. More stable and sure than glass tubes. They are leak -proof and can be used for liquids such as wine, water, etc. easy to use: with corks, the test tube can be easily opened and closed. It is leak -proof and protects leak fluid. You can wash the tube to keep it clean and ideal for repeated uses and others.