false Axygen's microcentrifuge tubes are manufactured from medical-grade polypropylene to exceed the exacting standards demanded of them by researchers. A wide range of styles and colors is available, from screw-cap to snap-lock, in capacities from 0.5ml to 2.0ml. Axygen's racking systems provide the ideal solution for tube organization and storage. microcentrifuge-tubes 7 Microcentrifuge Tubes 8 true