Pyrex* Graduated Heavy Duty Centrifuge Tubes with Beaded Rim

Of heavy wall construction, for greater mechanical strength, with durable, white enamel graduations. The 12 ml size is graduated upward from tip in 0.1 ml divisions. The 40 ml size is graduated in 0.5 ml divisions to 10 ml, and from 10 to 40 ml in 1 ml divisions.