EarthOx Sterile Centrifuge Tubes with Flat Caps 50ml (RCF 12000xg)(DNase/RNase free) (25 Tubes) 50 ml Conical Polypropylene tubes with Flat caps DNase/RNase Free, Sterile Easy-to-read black graduations are accurate to 2%, 2.5ml increments RCF up to 12,000xg Autoclavable at 121 and freezable to -80