The purpose of so-called continuous bonds lies in compensating for the costs of repetitive shipments throughout a certain period, normally 12 months. Regarding one-time transactions, the Single Entry bond (SEB) covers these, which the broker issues with obtaining a release for shipment.
A carrier that seeks to transport certain goods within the US for further export also needs special permission; its name consequently is the Transportation and Exportation bond (T&E). If the export is not immediate, and the goods will spend up to 3 years within the country, Customs issues the Temporary Import bond (TIB) to cover them. In case the goods are not allowed into the United States, they need re-exporting with no delay, which the Immediate Export (IE) bond guarantees.