MBP 5 mL Microcentrifuge Tubes by Molecular Biology Products are snap-cap polypropylene tubes rated to 14,000 × g, with 0.5 mL graduations and frosted writing areas. They hold samples that are too large for a 2.0 mL tube and can be stored down to -80 °C. Choose clear or amber. Tubes are certified RNase-free, DNase-free and nonpyrogenic and packed 250 per unit.