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). 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. Teal 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. Compare to VWR# 21008-242.