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Polypropylene tubes feature a convenient flat bottom so they stand on their own. Includes 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 250°F/121°C and freezable to -49°F/-45°C. Steam sterilized. Maximum RCF 9000.