The Imperial-Gallic helmet was based on the type of helmet used by the Gauls. These were more decorated than earlier varieties with embossed eyebrows, had a re-enforced peak and a ridged extension at the back as a neck-guard. These were initially probably made by Gallic smiths so retained the original influence in construction and design and stretched in use from the late 1st century BC through to the early 2nd century AD. These helmets were mainly made of iron with recesses for the ears and brass decoration including small circular bosses on the helmet and the cheek pieces. The crest holder consisted of a right-angled foot that slid into a tube on the crown of the helmet, although some versions found also have additional decorative plume holders at the ends of the peak.