SuperClear® 15 mL Conical Centrifuge Tube. 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). Validated Sterilization (ISO 11137) for use in Research and Medical labs. IATA 95kPa and U.S. DOT certified. Polypropylene USP Class VI resin. Centrifuging to 17,000 x G. Freezable to -80C. Autoclavable. Capacity: 15 mL. Purple color caps. 50 tubes per bag/10 bags per case. 17 mm W. 118 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.