PerformR® Conical Centrifuge Tubes. 15mL, Sterile. With attached plug style screw caps. Black printed graduations and white writing spot. 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 -80C. Autoclavable tubes. Teal color caps. 50 tubes per bag/10 bags per case. 17mm W. 118mm H. Made in USA.