MBP Thin Wall PCR Tubes by Molecular Biology Products are individual tubes made from 99.9% pure virgin polypropylene, with thin walls for efficient heat transfer in standard thermal cyclers. Choose 0.2 mL tubes with domed caps, flat caps, assorted colors or no cap, or 0.5 mL flat cap tubes. All are certified RNase-free, DNase-free and nonpyrogenic and packed 1,000 per unit.