P.I.P. Round Bottom Tube is disposable and available in two models of transparent and opaque, which are non-sterilized. The transparent model is made from polystyrene which is sterilizable by Gamma irradiation, while the opaque model is made from polypropylene which is autoclavable and both models are sterilizable by ethylene oxide. These tubes are vastly used in immunoassay tests (RIA, EIA…) and can be also used for storing or diluting samples. Due to their dimensions, these tubes can be used in most laboratory and medical equipment with no need to change the tubes and this prevents losing samples while transferring them.