... round thick al pcb base board 2.high quality 3.Fast delivery,competitive price 4.ROHS, UL, ISO9001-2000, ISO14001 1. 3mm round ... gold,immersion gold,OSP,immersion silver,immersion tin,peelable mask Board Size: 650mm*1000mmBoard Layer: 1L-4LBoard thickness: 0.8mm to ... the quality during manufacturing process instead of inspection white ink round pcb board