ULAB Scientific Cylindrical Glass Test Tubes, Vol.20ml, 20x150mm, Borosilicate Glass, Pack of 10, UTT1002 Including 10pcs of glass test tubes 20ml, 20*150mm, 1.0~1.2mm thick, round bottom ULAB glass tubes are made of borosilicate glass that withstands thermal shock and chemical attack, reduces pH changes and contaminants leached from soda lime glass tubes. The tubes are uniform bottoms, fire-polished rims, consistent lengths, and convenient packaged in shrink-wrapped inner box. They can be used for mixing heating and/or holding small quantities of chemicals for assays, as well as tissue culture, blood banks, and other laboratory experiments. This multi-functional borosilicate glass test tube features a rolled lip and can be used in the laboratory, the classroom, for crafting, storage or even in the kitchen to hold spices. With your imagination, its uses are limitless.ULAB glass test tubes 16x150mm are also available on Amazon, search ASIN: B07FDZ34VH.After-Sales ServiceULAB Scientific guarantees that no sale is complete unless the customer is satisfied.If you have any questions or suggestions on our products or service, please do feel free to contact us.You'll get our reply within 24 hours. Thanks for your patience.