... freeSolder mask: GreenSilk screen: WhiteThe othere surface finish we could do are; Gold finger, OSP, ENIG, HAL, Gold plating, ... Chemical silver, etc.The other solder mask type we could do are: Red, yellow, white, black, purplePCBA&SMT PCB& ... pcb electronicProcessing:uses the SMT non-lead craft, meets the international environmental protection requirement.Optional housing materials: Aluminum alloy, ABS ...