In metallurgical technology smelting iron and steel, for example, people of Majapahit had already possess the ability of creating the Majapahit's heritage, such as keris, spears, arrows, even barunastra, a giant tipped steel arrows that functioned like an underwater torpedo, in which when it was fired, it have the ability to penetrate and bilge the ship. Demak kingdom as the descendants of Majapahit has the ability to create a large caliber of cannons in which exported to Malacca, Pasai, even Japan. The fact that Japanese bought guns from Demak sourced from the record of the Portuguese, during the conquered of the Port of Malacca, the Portuguese intelligences sourced that the Malacca fortress was complemented by large-size of cannons imported from Java.