Polypropylene tubes feature a convenient flat bottom so they can stand on their own. Include blue HDPE leak-proof screw caps, silk-screen black graduations and a large white marking spot. Tubes are graduated from 5 to 50ml with graduation intervals of 2.5ml. Autoclavable at 121°C and freezable to -45°C. Steam sterilized. Maximum RCF 9000. Additional Info: Self Standing Centrifuge Tubes, Pp/Hdpe Package Size(L x W x H): 12 X 8 X 6 (IN) Categories: Centrifuge Ware, Tubes HTS Code: 3926.90.9910 UNSPSC: 4.11217e+007 Country Of Origin: CHINA