Professional-grade universal microcentrifuge tubes designed for the collection, storage, and transport of small biological samples, chemical reagents, and laboratory specimens. These tubes contain no additives or clot activators, making them ideal for a wide range of applications, including molecular biology, sample dilution, and storage of serum or plasma after separation. Made from high-clarity, medical-grade polypropylene, they are resistant to mechanical stress and feature a secure, leak-proof snap-cap to prevent evaporation or accidental opening during centrifugation. Their smooth internal surface minimizes liquid retention, ensuring maximum sample recovery.