Riddle: I move in a sequence, one to seven, then back to one, a…

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i-have-keys-but-open-no-locks-i-have-strings-but-im-not

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what-dances-in-the-day-yet-hides-at-night-wears-a

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i-can-be-cracked-made-told-and-played-what-am-i

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i-measure-much-yet-have-no-weight-and-scale-the-heights

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i-start-as-a-seed-but-i-am-not-sown-you-crack-me-open