Packaging: 1pc X clear glass blowing tubes High Transparency: The glass tube is characterized by its high level of transparency, this element allows it to be functionally effective and visually appealing simultaneously Material: Made from highgrade borosilicate glass for exceptional durability and thermal resistance. Extensive applications: They are applicable to various scientific experiments, teaching, and household uses. The quartz sleeve is fragile. Please handle it with care when you take out or install the glass sleeve., Manufacturer: QLFSP