... ) Materials silicon steel sheet 3) Used for lighting Ballast Magnetic Core Lamination:1. Specifications: EI-203 (width: 203mm)2. Materials (silicon ... , B50A470, B35A550, B35A440 b) Tai steel: 50TW800, 50TW600, 50TW1000, 50TW470 c) Wu steel: 50WW1300, 50WW800, 50WW600, 50WW470, 350WW360, 350WW310 d) An ... manufacture high speed progressive dies. Silicon Steel Lamination/ballast magnetic core lamination