Centrifuge tubes are precision molded from premium-grade, chemically inert plastics. Accurate, easy-to-read graduations re molded-in at 0.1 ml intervals from 0-1 ml and at 0.5 ml intervals from 1-5 ml and every 1 ml from 5-15 ml. The outside diameter is 17 mm and the overall Length is 120 mm.