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The viola da gamba uses the alto clef.[citation needed] Seven and occasionally eight frets made of "stretched gut" are tied on the fingerboard around the instrument's neck.[1] Frets tied in this manner—instead of permanently fixed as on a guitar—allow for fine-tuning of the instrument.[1] (Frets enable the performer to stop the strings more cleanly, improve consistency of intonation and lend the stopped notes a tone that better matches the open strings.)[citation needed]