... special brass. If by lead and tin, manganese, nickel, iron, lead, silicon composed of copper alloys ... , rods, tubes, casting parts, etc. Contain copper in 62% ~ 68%, plastic, strong manufacturing compression equipment, ... From about A.D. 1230 starting in brass products in Europe popular about 300 years, because ... safety done, with packed in lead in the dark pin fixation bolt in stone base. Put a layer ...