Test Tube with Attached Red Screw Cap, 16 x 120mm (15mL), PS, Sterile, Individually Wrapped. These multipurpose screw cap test tubes are offered in polystyrene (PS) or polypropylene (PP) and suit a variety of applications. Please note: We cannot accept returns for the following: Sterile items, prefilled formalin containers, Sedi-Tect™, Cul