Kimble Chase KIMAX Borosilicate Glass Centrifuge Tubes have a conical bottom, marking spot. Choose from two styles:
Centrifuge tube EF4804AK has a beaded rim and red scale and is provided without closure.
Centrifuge tube EF4824AK has a 15-415 threaded top and white scale that is calibrated to contain. It includes a phenolic, rubber-lined screw cap.