Fisherbrand 1.5mL MCT Graduated Mixed Flat-top snap caps provide a safe, liquid-tight, reliable seal even with prolonged boiling Capacity: 1.5mL high-clarity polypropylene Graduated in 0.1 and 0.25mL 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 +121C Fit all standard rotors Nonpyrogenic Autoclavable at 121 C/15psi for 15 minutes