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.