Pistola correctora ósea eléctrica de 6 cabezales y 13 niveles, activador, masajeador de terapia cervical, herramienta quiropráctica ajustable para columna vertebral

Length of each use: it is recommended to use 30 minutes each, and rest for 10 minutes.Must be tight top can hit, the greater the intensity of the top, the greater the intensity of the blow.so we should choose the appropriate stalls, can not directly hit the top of the bones.