P.I.P. Conical Tubes are disposable and made from transparent polypropylene. These Tubes are graduated and available in four sizes of 5ml, 15ml (graduated up to 12), 25ml and 50ml for storing and centrifuging samples up to 6500 g (RCF). They are also autoclavable and freezable. These tubes have screw top lids in different colors and are resistant to most of the common laboratory acids and chemicals.