1)Morn than 10 years experience in PCBA manufacturing 2)Single-sided,double-sided,multilayer PCBA 3)Good after-sale service Controllers for 1in1 Air conditioner pcba factoryPCBA specific instructionMaterial:FR-4Layer: 2 layersSurface finish, HASL lead freeSolder mask: GreenSilk screen: WhiteThe othere surface finish we could do are; Gold finger, OSP, ENIG, HAL, Gold plating, Chemical silver, etc. ...