MBP 1.5 mL Boil-Proof Microtubes, Bulk Packed, by Molecular Biology Products are polypropylene tubes rated to 16,700 × g, with 0.1 mL graduations and a SnapLock cap that stays shut during heating. Bulk packing at 5,000 tubes per case suits teaching labs, core facilities and high-use benches. Tubes are non-sterile and certified RNase-free, DNase-free and nonpyrogenic.