... PCB assembly specific introduction:1.Optional materials:Aluminium alloy,ABS,or other materials2.Layer: 2 layers3.Surface finish, HAL lead free4.Solder mask ... HAL, Gold plating, Chemical silver, etc.7.The other solder mask type we could do are: Red, yellow, white, black ... other industries equipment productsCertificationISO9001-2000,UL,RoHSR&Dengaged in PCB assembly, LCD driver, ODM and OEM ect ...