BD Vacutainer® SST™ Venous Blood Collection Tube Clot Activator / Separator Gel Additive 8.5 mL Conventional Closure Plastic TubeBD Vacutainer® SST™ Venous Blood Collection Tube, 8.5 mL, 16 x 100 mm 8.5-mL serum tubes have conventional closures which are red/gray mottled. Silicone coated tubes come with a clot activator /...