Made of high-clarity polypropylene Graduated in 0.25 mL increments Withstand forces up to 30,000 x g Easy-open caps with needle insertion spot and textured marking area Labeling area on tube exterior Highly polished interior for maximum sample recovery Temperature range of -80°C to +121°C Fit all standard rotors Nonpyrogenic Autoclavable at 121°C/15 psi for 15 minutes