The adaptability of the mask allows to control the directional application of the force by adjusting the bar of the coupling of the elastics so that it fulfills the protactive force in the desired plane. Adjustable to the forehead and chin allows adaptation to the majority of patients. The angle of traction is determined by the adjustment of the bar to engage the elastics, to give horizontal forces up or down as necessary. Recommended elastics of 1/2 "and 16oz .."