Bio-Plas® brand 0.2mL PCR* tubes which are made of virgin polypropylene. These thin-wall reaction tubes are designed for use with 96-well thermal cyclers. Extra thin wall design is almost transparent for better viewing of contents and ensures rapid thermal transfer. This ensures a significant reduction in cycle and PCR reaction time. Tubes have attached snap-caps that "click" to let you know there's a good seal. Nonsterile.