aluminium frame: 1.OEM services,R&D speaker part mold 2.15 year experiences ... ADC1, LM6-M, LM20-M, Zamak3, Zamak5, ect.R&D capacity:Professional tooling development & process & designProduction Equipments:150T-1800T ... three-axle machining centers.Test Equipments:Hardness tester,Chemical analysis,Digital Measuring Projector, Dynamic Balancing Tester, universal testing machine & Coordinate- ...