... of PP,it has high grade of transparency.This centrifuge tube with screw cap,so it can keep shape and good seal ... .The bottom is u-shape .U-shape bottom,screw cap,with printed graduation,autoclavable,CodeDescriptionMaterialPackingMCT-50ml-u-RRed cap ... /cartonSterile:It can be available upon request.MEA :62x34x29 50ml Centrifuge Tube