SP Microcentrifuge Tubes 2.0 mL Graduated Flat Cap Yellow Cardinal health Made of tough, clear, proprietary formulated polypropylene, the G-Tubes has the same chemical resistant quality as standard tubes, but they're sturdier and virtually transparent to give a better view RNase and Dnase free. Human DNA free. Non-Pyrogenic The interior has the smoothest, most highly polished surface of any tube on the market The walls are non-wettable, preventing liquids from adhering to the sides Built for high impact usage and will withstand over 30,000 x g when spun Thicker walls make this the tube of choice for extreme stress, high spinning speeds, autoclaving, boiling, chemical resistance, and freezing Graduation: From 0.1 to 2.0ml Withstands temperature ranges of -80 C (-112 F) to 121 C (250 F) Autoclavable at 250 F at 15 psi for 15 minutes Inscribing Patches: Textured writing surface on top of the caps and on the side of the tubes