Fisherbrand 0.6 mL MCT Graduated Natural high-clarity polypropylene Graduated in 0.1mL markings 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 to +121 C Fit all standard rotors Nonpyrogenic Autoclavable at 121 C/15psi for 15 minutes