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Passing thread is couched down singularly in the same colour sewing thread or a contrasting colour. Passing thread is often used for Or Nue (couching down the passing thread with different colour threads to create a design or pattern on the surface of the passing thread) and underside couching. No. 13 Passing threads are synthetic and will not tarnish.No. 13 Passing thread: Approximately 0.8 mm across the width of the thread. Price per reel.