FEATURES *Designed to withstand the stresses of high speed centrifugation of 23,000 RCF in a fully supported rotor *Made from high quality medical grade polypropylene *Transparent wall permits easy viewing of tube contents *Attached flat cap for labeling and with writing area on the side of the tube *RNase & DNase Free, sterile *Working temperature: stable from -20°C to 121°C (Autoclavable) *Accurate graduation marks: 0.1ml, 0.5ml, 1.0ml and 1.5ml *Thumb-friendly beveled lip convenient one-hand operation