Tubes VACUETTE® Z Serum Sep Clot Activator Venous Blood Collection Tube Serum Tube Clot Activator / Separator Gel Additive 13 X 100 mm 5 mL Red / Yellow Ring Pull Cap Polyethylene Terephthalate (PET) Tube (50/PK 24PK/CS) by Greiner Bio-One ID 456073P