... of PCB 2.High precision,100% test 3.HASL,OSP,immersion gold 4.UL,ROHS,ISO9001 5.Good quality, price concessions General ... .008”(0.4mm ±0.1mm)Bow and twist < 7/1000 Copper Weight Outer Cu weight 0.5oz ~ 3.0ozInner Cu wight ... confused with pcb,kindly contact me for more details! fr4 copper clad laminate pcb board manufacturer