At the time, East Asia had not yet created superior metal casting technology similar to Western countries, which meant that large cannons were unable to be produced and relatively numerous rocket-shaped weapons were introduced in siege warfare and naval battles.
西洋諸国のように大形の大砲を製造できるほどにまだ鋳造技術が優れていなかった当時の東アジアでは、こうしたロケット型の兵器が攻城戦や海戦で比較的多く導入された。