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Variations may include a separate glued-on neck, a two-piece top plate of contrasting woods, old-style friction tuning pegs in palisander or ebony, guitar-style box construction, or even a hollowed-out neck. The size, shape, and number of soundholes is highly variable and may be a single round or oval hole, dual crescents, or even multiple holes of varying arrangement. Another variant is a neck with two holes bored 3/4 of the way through, parallel to the fretboard and close to the headstock (an innovation said to color the instrument's tone).[citation needed]