The spear is the work of young employees at Ube Steel Co., a unit of chemical manufacturer Ube Corp., which has many plants in the city. The employees first proposed creating the spear in July last year, and about 40 people became involved in using scrap steel and other materials to make the sculpture, which weighs about 1.2 tons. They recreated the characteristic spiral design of the spear's shaft following repeated exchanges with the series' copyright management, they said. At an opening ceremony last month, Ube Steel President Hisao Yamane recalled how he "never thought (the project) would come to fruition."