Volumes of 0.65 mL, 1.7 mL and 2.0 mL fit all popular microcentrifuge rotors. Writing surface on flat cap and side wall for quick sample ID. Unique side-gated mold design eliminates risk of glove or finger puncture caused by sharp bottom-gate protrusions on other tubes. Superior clarity and external graduations ensure accurate, reproducible lab results. Target syringe stands temperatures from +121°C to -80°C and an RCF of 17,000xg. Positive ClickSeal™ design allows repeated cap closures and eliminates pressure-induced popping of caps during incubation. All tubes available in natural polypropylene, in RainbowPacks of five transparent colors, or as packs of a single color. Tubes are also bagged and radiation sterilized in small RadPacks.