SciStar microcentrifuge tubes are certified sterile, RNase free, DNase free, and pyrogen free. The polypropylene material provides a high resistance to chemical stress, mechanical stress, and the extreme temperatures found in laboratories. Pre-closed for convenience, these sterile polypropylene centrifuge tubes are great for a variety of laboratory and everyday uses. Certified sterile and RNase free / DNase free makes these lab centrifuge tubes perfect for PCR reactions, DNA extractions, RNA extractions, nucleic acid purification, protein separation, and more! Great for home uses including seed container and seed storage, essential oil storage, crafts, food colors, and many more. The included reusable storage container is wide-mouth, easily accessible, and comes sterile. Great storage for waste, used pipette tips, or trash.