1)4-layer computer mother board pcb 2)Base material: FR-4 3)Surface ... )certificate:UL,ROHS,REACH ISO9001 T/S16949 1)4-layer computer mother board pcb2)Min hole width:0.2mm3)board thickness ... , LEAD FREE HAL, ENIG/IMMERSION GOLD, OSPSOLDER MASK COLORGREEN, BLUE, BLACK, WHITE,REDTECHNNOLOGYBLOCK,BGA,PEELABLE,CARBON INKASSEMBLYLEAD FREE,NOT LEAD FREELEGEND ...