Economy Rimless Borosilicate Test Tubes - 25 x 150 mm, Pack of 100This pack of 100 25 x 150mm Economy Rimless Borosilicate Test Tubes is perfect for a wide range of scientific experiments where rimless tubes are required. Constructed from high quality borosilicate glass, these test tubes offer excellent durability and resistance to heat and chemicals, making them suitable for repeated laboratory use. How the product may be used: Conduct chemical reactions in rimless tubes. Heat substances in controlled experiments.