A unique combination of softly braided cotton retraction cord and an ultra-fine copper filament centre which is double-wrapped with nylon. The cord can be preformed or shaped around the sulcus. Stay Put Retraction Cord Fine No.1 A unique combination of softly braided cotton retraction cord and an ultra-fine copper filament centre which is double- wrapped with nylon. The cord can be preformed or shaped around the sulcus.