12x75mm Glass Test Tube, Screw Top, With Cap, Black (Pack 10) Karter Scientific 402C2

Karter Scientific® is a registered trademark in United States of America. To maintain quality control, authorized permission is required in the resale of our products. These reusable glass round bottom Test Tubes are made of 3.3 borosilicate glass to reduce pH changes and contaminants potentially leached from soda-lime glass. Black Screw Tops are fabricated from a special formula resistant to the effects of temperature and steam in autoclaving.