Tubes can be autoclaved to 121°C and withstand temperatures down to -190°C. Dimensions: 12.5x43 mm. Designed for the storage and transportation of biological material. The external thread design provides a smooth and uniform inner surface, thus reducing the risk of contamination. The closures and tubes are both manufactured of polypropylene having the same coefficient of expansion, which further enhances their leakproof qualities at changing temperatures. Skirted tubes are not recommended for centrifugation. Material: PP.