0.7ml screw cap microtubes with conical bottom and silicon ring are offered here with the assurance of complete sterility. These high-quality products are made using virgin polypropylene. The externally threaded tubes have screw caps which are ideal for transit, long-term and low-temperature sample storage. They are constructed of 100 percent virgin polypropylene that is ultra-clear. RNase, DNase, and endotoxins are not present in these 0.7ml screw cap microtubes with conical bottom and silicon ring, which are non-pyrogenic in nature.