Asynchron control with forward pivot, with 15° inclination of the back and 9° of the seat. Two groups of clutches make it possible that the back and the seat are completely indipendent of each other. Leaving the clutch open, the back becomes permanent contact. The seat clutch allows it to be locked in any position. The tension of the back can be regulated according to the user\'s weight by turning the knob found underneath the mechanism.