1)4-layer computer mother board pcb 2)Base material: FR-4 3)Surface Finish: HAL 4) ... certificate:UL,ROHS,REACH ISO9001 T/S16949 1)4-layer ... , ENIG/IMMERSION GOLD, OSPSOLDER MASK COLORGREEN, BLUE, BLACK, WHITE,REDTECHNNOLOGYBLOCK,BGA,PEELABLE,CARBON INKASSEMBLYLEAD FREE,NOT LEAD FREELEGEND COLORWHITE, BLACK, YELLOW ...