12 mL polystyrene translucent test tubes are rimless.16 x 100 millimeters.Molded from premium-grade polystyrene (PS) for clarity.Can withstand 3,000 RPM during centrifugation.Tubes are nongraduated with round bottoms and no color coding.Brittleness temperature: 20° C.Maximum temperature: 90° C. –> Shop About Us Contact Us Reviews and Ratings McKesson Test Tube 1500 RPM Round Bottom 177-111012 2000 Count McKesson | MFG #177-111012…