These conical bottom centrifuge tubes from Corning are supplied with pennyhead stoppers. 5 mL, 15 mL, and 50 mL tubes are available. 15 mL size has 1 mL graduations upward from tip; 50 mL size has 0.5 mL graduations upward from tip to 10 mL and 1mL graduations from 10 to 50 mL.
Specification
Material: borosilicate glass Sterility: non-sterile Stopper size: 9 O.D. × L: 13 mm × 117 mm Capacity: 5 mL