NiTi universal ring with outstanding spring strength and memory. Better adaptation of the matrix band in larger cavities. Grips around the tooth and does not fall into the cavity. V-shape design allows separation of teeth. The tines clasp around the wedge so it is possible to insert the wedge after placement of the ring. The narrow ring has the same innovative features and benefits of the universal ring. Tines are set closer together for optimal separation on smaller teeth, with up to 4kg of separating force, even on premolars.