6000 xg, PP, sterile, white graduation line. High-quality polypropylene material, ultra-high transparency, easy to observe Aseptic packaging, no DNase, RNase and pyrogen. Leak-proof sealing design of the tube cover, one-handed operation of the switch. High-quality mold, ultra-smooth inner wall, sample is not easy to remain. Printed scale, large white writing area, easy to identify samples. Can withstand extreme temperature range -40℃~120℃. Can withstand centrifugal force 10000g.