They were modified versions of the Orfey class built in Russia with the assistance of the French company Augustin Normand.
The ships were an enlarged version of previous designs with a longer raised forecastle, and Frahm-type anti-rolling tanks.
An extra 100-millimetre (4 in) gun was added and the number of torpedo tubes reduced.
The ships were delayed due to ordering machinery from Switzerland which was embargoed on the outbreak of World War I.
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