Leone First Class is the perfect appliance to get a rapid controlled distalization of the upper molars, conceived with the technical and scientific cooperation of Drs. Arturo Fortini, Massimo Lupoli and Mr. Massimiliano Parri. The vestibular and lingual tubes are made with MIM® technology for maximum comfort and precision. The bicuspid tube is a little higher to compensate the non-perfect alignment of molars that may be found in some patients. One turns a day activation produces a distal movement of 0,1 mm sufficient to get molar distalization with a minimum loss of anchorage.