PYREX® borosilicate glass, conical, heavy duty, beaded rim.

• Tubes 12 ml are graduated upward from tip in 0.1 ml divisions
• Tubes 40 ml are graduated in 0.5 ml divisions to 10 ml and from 10 to 40 ml in 1 ml divisions

The tubes are of heavy wall construction, for greater mechanical strength, with durable, white enamel graduations.

In order to conform to outside diameter and overall length limitations imposed by centrifuge rotors and supports, it has been necessary to reduce the capacity of these heavy duty tubes.