0,5ml PCR tubes. Graduated.rMade of autoclavable polypropylene. Certified RNAse, DNAse and pyrogen free.rAttached hinged caps are flat and easy pierceable. Tubes are easily opened and closed with one hand.rTubes have moulded-in graduations in 0,1ml increments from 0,1 up to 0,6ml, and a frosted panel on their side for writing or labelling.