PROTECT as the Pioneer of Chinese Self-ligating Brackets, has always been innovative and constantly upgrading our products. Today, we'd like to introduce you a totally new series Self-ligating brackets: PT-ZERO. The innovative round shape greatly reduces the friction between the bracket and the oral mucosa. Product:PT-ZERO self ligating brackets Torque:ROTH/MBT/HIGH/STANDARD/LOW Base:80 gauge mesh base