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- White key width = exactly 7/8 inch. Visible length = 6 in., including a 1/16" "lip" on the top surface that sticks out beyond the end of the key proper. Visible height when not depressed = 7/8 in. Black key width at white key level = 15/32" tapering up to 7/16" at the top, which is 1/4 in. above white key level.
Modern piano keyboards ordinarily have an octave span of 164–165 mm (6.5–6.5 in), resulting in the width of black keys averaging 13.7 mm (0.54 in) and white keys about 23.5 mm (0.93 in) at the base, disregarding space between keys.
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