(PP) amber colour, semi-transparent, it allows the sample visual-check. They protect photosensitive samples from light. With hinged snap flat caps, provided with easy one-hand operation, easily pierceable. Graduated with large writing area (1.5 and 2.0 ml). Certified RNase, DNase, human DNA, ATP, PCR inhibitor and pyrogen free. Particularly suitable for applications in PCR and other applications in molecular biology. Temperature of use: -80 °C / +100 °C. Autoclavable open at +121°C for 20 minutes.