... , HASL lead freeSolder mask: GreenSilk screen: WhiteThe othere surface finish we could do are; Gold finger, OSP, ENIG, HAL, Gold ... SMT&electronic assembly&pcb electronicProcessing:uses the SMT non-lead craft, meets the international environmental protection requirement.Optional ... housing materials: Aluminum alloy, ABS, or other materials.Lead time of prototype: 1. 10-15days, with customers ...