There were several variants of the violin bow fibula. The bow could bend, or zig-zag from side to side while still remaining flat and parallel to the pin. These variants, such as the Grunwald type and the Hanua type, were found in the 12th and 11th centuries BC. In another variant, the bow, while still flat, widened out into an oval or diamond shape (blattbugel in German). These variants, such as the Kreuznach type and Reisen type, were found in the 12th to 10th centuries BC.