S.C. Code § 59-107-120
The state institution bonds must be in the denomination of one thousand dollars or in any multiple thereof. They shall bear interest, payable semiannually, at a rate or rates not exceeding the maximum interest rate specified in the State Fiscal Accountability Authority's request for the issuance of the state institution bonds. Each issue of state institution bonds shall mature in annual series or installments, the last of which shall mature not more than twenty years after the date of the bonds. The installments or series may be equal or unequal in amount. The state institution bonds may, in the discretion of the State Fiscal Accountability Authority, be made subject to redemption at par and accrued interest, plus such redemption premium as it may approve, and on such occasions as may be specified in the request for the issuance of the state institution bonds. State institution bonds may not be redeemable before maturity unless they contain a statement to that effect.
S.C. Code § 59-107-120