Detailed Product Description Board thickness; 2.0mmMaterial: FR-4Layer: 6 layerSurface finish: HAL lead freeMin trace width and space: 4 milMin hole size: 0.15mmCopper thickness: 1 0ZSolder mask: GreenSilk screen: WhiteThe othere surface finish we could do are; Gold finger, OSP, ENIG, HAL, Gold plating, Chemical silver......The other solder mask type we could do are: Green, yellow, white, black, ...