Made from borosilicate glass having excellent chemical resistance. Ideal for laboratory use due to their neutrality, impermeability and extra strength. These tubes feature smooth wall with no irregularities and fire-polished tops to eliminate rough edges. Available in round or flat bottom, with or without Lip/Rim. Available in all regular sizes and can be custom produced as per required specifications. We also supply tubes in sizes 1" x 6" and 1" x 8" with round bottom for vanilla beans/pods and cigars.