Designed for oil-free operation, these tubes are made of transparent superior quality grade polypropylene for better viewing of the contents. Their ultrathin wall design will ensure rapid thermal transfer and a significant reduction in cycle and PCR reaction time. Attached hinged caps and can be used with heated lids used by thermal cycler manufacturers. They provide positive sealing during thermal cycling and will prevent evaporation while being easily opened and closed with one hand. Frosted writing surface for sample identification. Packaged in tamperproof resealable safety-lock bags.- Reaction Tube, 200ul Red, Flat Top & Contamination Shield, 1000/pk 14-21 Days