Eppendorf 022431064 Polypropylene Protein LoBind Microcentrifuge Tube, PCR Clean, 0.5mL Capacity (Pack of 100) Volume: 0.5mL; PCR clean Specially developed technology and the purest, select polypropylene result in tube binding that ensures minimal loss (&lt; 3%) Designed for use in proteomics or other fields of protein research Enzymes remain active, and they are not denatured by any tube-surface interactions Additional features include Safe-Lock lid and a high degrees of transparency; rated to 18,000 x g