Premium 0.5 mL RNase/DNase-free screw-cap self-standing tubes designed for secure sample storage, centrifugation, and molecular biology workflows. QC-tested for consistent performance and sample protection, these clear tubes provide easy sample visibility, a stable self-standing base, and a secure screw-cap closure to help minimize leakage during handling and storage. Ideal for high-volume labs requiring reliable tubes for nucleic acid, protein, reagent, and general sample applications.