ACRYLIC TUBES ARE BETTER THAN POLYSTYRENE! Our 15mL centrifuge tube is produced from Acrylic which provides a stronger, chemically resistant, and scratch resistant surface. Our tubes can be spun 2 ½ times faster in the centrifuge compared to polystyrene equivalents! The centrifuge tubes feature flat-top, plug-seal leak-resistant screw caps, a large white writing area, and printed graduation marks. Sterile tubes are RNase free, DNase free, and Pyrogen free.