Bronze halberd, doka (bronze halberd for rituals), and bronze swords distributed mainly in northern Kyushu, Sanin and the Shikoku region were introduced at the end of early period and manufacturing started right after that.
北部九州や山陰、四国地方などに主に分布する銅矛や銅剣、銅戈などは、前期末に製品が持ち込まれるとともに、すぐに生産も開始された。