Feature●🧪 AUTOCLAVABLE AND FREEZABLE: Centrifuge Tubes,conical bottom tubes; it is autoclavable at 121℃/249.8℉ and freezable to -80℃/-176℉.●🧪 SUPERIOR FEELING: transparent test tubes , easy to observe the sample,The tube body has eye-catching measurement markings, accurate and clear scale, easy to close the cap, good sealing, open the cap smoothly, easy to operate●TUBE MATERIAL: The centrifuge tubes body is made of polypropylene (pp) and the cap is HDPE, which is free of heavy metal ionsDescription