A very useful anterior torquing spring used to generate more positive torque in the upper incisors. The device ends hook distally to each upper central bracket and the centre circle (coil) is pressed into the archwire. This spring contacts, and presses on, the tooth surface, gingival or occlusal of the bracket. The pressure from the spring causes the tooth to move in the direction of the force  resulting in a lingual root movement.
(5 per pack)