S.C. Code § 7-13-1710
In every county, city or town providing voting machines, the board of voter registration and elections shall furnish to the managers of election a sufficient number of ballots printed on clear white paper, of such form and size as will fit the ballot frames of the machines, the arrangement of the names of the candidates on such ballots to be prescribed by the board of voter registration and elections. Party nominations shall be arranged on each voting machine either in columns or horizontal rows, as shall nominations by petition, and the captions of the various ballots on such machines shall be so placed as to indicate to the voter what push knob, key lever or other device is to be used or operated in order to vote for the candidate or candidates of his choice.
S.C. Code § 7-13-1710