S.C. Code Ann. § 11-15-490

All such refunding bonds shall be in the form of negotiable coupon bonds, payable to bearer, but may contain provisions granting to the holder the privilege of having them registered on the books of the treasurer of the issuer and the principal thus made payable to the registered holder (unless the last registered transfer shall have been to bearer) upon such conditions as the governing body may prescribe. Unless registered such bonds shall have all the qualities of negotiable instruments under the law merchant and the Uniform Commercial Code.