8-layer E-book pcb 1)Base material:FR-4 2)Surface:immersion gold 3)Certificate:UL,ROHS,REACH,ISO9001, 1)8-layer E ... , ENIG/IMMERSION GOLD, OSPSOLDER MASK COLORGREEN, BLUE, BLACK, WHITE,REDTECHNNOLOGYBLOCK,BGA,PEELABLE,CARBON INKASSEMBLYLEAD FREE,NOT LEAD FREELEGEND COLORWHITE, BLACK, YELLOW ...