PerformR® Conical centrifuge tube. 50 mL. Sterile. With attached plug style screw caps, black graduations and white writing surface. 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 12,500 x G; Freezable to -80C. Autoclavable tubes. Capacity: 50 mL. Teal color caps. 25 tubes per reusable polypropylene rack/12 racks per case. 29 mm W. 115 mm H.. Made in USA.