This pack of 25 test tubes is made of high-quality borosilicate glass and comes with screw cap lids. Each tube has a capacity of 20 ml and measures 12mm x 150mm. The tubes are manufactured in the United States and are suitable for a wide range of applications in laboratories, dental clinics and medical facilities. They are also ideal for use in businesses that require glassware for storage or display purposes. The tubes are branded as PYREX, a trusted name in laboratory glassware, and are a reliable and durable choice for professionals who demand the best.