... tube is made of PP,it has high grade of transparency.This centrifuge tube with screw cap,so it can keep ... u-shape .U-shape bottom,screw cap,with printed graduation,autoclavable,CodeDescriptionMaterialPackingMCT-50ml-u-RRed cap,No-sterile,Bulk PackPP100pcs/polybag, ... 1000pcs/cartonMCT-50ml-u-bBule cap,No-sterile,Bulk PackPP100pcs/polybag,1000pcs/cartonSterile:It can ...