A centrifugal unit comprising a centrifugal component and a plurality of tubes, said unit to turn around an axis to separate the components of a liquid, blood in particular, with such plurality of tubes displaying a single tubular component wherein said unit includes: a base in the form of a disk; an external cylindrical wall extending from the base; an internal cylindrical wall extending from the base and separated by the external wall so as to define a ring-shaped separation chamber among each other; a tubular housing almost extending coaxially to said rotating axis from the base to receive an end of a tubular unit; and a plurality of channels extending radially in the base of the centrifugal unit, with each channel providing communication between a respective tube of the tubular unit and the separation chamber, with the centrifugal unit having a radius between 25 and 50 mm and a height between 75 and 125% of the radius. view more