Vacuum Blood Collection Tube (Red cap) Tube material: glass or plastic Volume of blood draw (ml): 1~10ml Tube Spec.(mm):12/13*75,12/13*100,15/16*100,15*120mm Tube with red cap, called No Additive Tube or Plain Tube, used for blood collection and Conventional serum experiment (clinical biochemistry test, immunity test, Radioimmunoassay test, PCR ,etc. )