SuperClear® Conical Centrifuge Tube. 50 mL. Sterile. With attached flat screw caps. Caps include integral molded elastomeric seal. Patented anti-smear writing surface. 3 color printed graduations and reverse reading scale. ATP, RNase/DNase and Endotoxin Free (non-pyrogenic), Sperm Motility Assay (SMA) Mouse Embryo Assay (MEA) validated safe for cell culture. Validated Sterilization (ISO 11137) for use in Research and Medical labs. Polypropylene USP Class VI resin. Centrifuging to 20,000 x G. Freezable to -80C. Autoclavable. Capacity: 50 mL. Purple color caps. 50 tubes per bag/10 bags per case. 29 mm W. 115 mm H. This product has been independently audited for the Accountability, Consistency, and Transparency (ACT) Environmental Impact Factor label for laboratory products. Made in USA.