In Bourges, Lyon or Plombières-lès-Dijon a series of cast copper alloy draft have been uncovered that relate to the manufacture of kettledrum and double drum fibulae. They are found as a spindle with a triangular cross-section completed by one or two small circular globes with a hemispherical or conical section which constitutes a reserve of metal for forming the drums. These little known artifacts appear (for the moment) in a fairly limited area of distribution and seem absent from southern or northern sites that could hold a production of copper alloy fibulae. These elements could indicate several types of traffic and exchanges: transfer of a particular technique of shaping fibulae from a prefabricated, artisanal circulation or half-product circulation. The presence of imported objects on these sites traditionally associated with princely residences raises the question of the status of artisans and the role of "elites" in handicraft production. Furthermore, these elements show the communication and exchange channels between these settlements of the 5^th century BC.