1.cu base cob pcb board 2.Fast delivery,competitive price 3.ROHS, UL, ISO9001-2000, ... gold,immersion gold,OSP,immersion silver,immersion tin,peelable mask Board Size: 650mm*1000mmBoard Layer: 1L-4LBoard thickness: 0.8mm to ... punching:±0.15mmbreakdown voltage 3KV - 5KVpeel strength≥1.4N/mm metal base cob pcb board