Tube body and cap are polypropylene, with no deformation after high temperature, high pressure (121° C, 15 minutes) and no embrittlement under low temperature (-196° C).. Tube can tolerate static extrusion and dynamic impact.. Leakproof, the tapered bottom design helps withstand centrifugation.. Flocked swab is made with an innovative jet embedding nylon technology; the nylon is adhered vertically and uniformly on the surface of swab tip, improving the efficiency of collection and release of cells and liquid samples to improve analytical sensitivity.. Swab, sample collection and transport tube are packaged together in a blister pack and are sterilized together by gamma both inside and outside of package; there are 100 of these blister packs in a box..