... better logistic service; 5.UL,SGS,ROHS,ISO9000. We can manufacture PCB in higher quality, more competitive price, quicker ... capacity for your reference, for more messages, pls contact with us freely!ItemSpecification MaterialFR-4 / Hi-Tg FR-4 ... 8um(tolerance),purity 99.5%Impedance Control±10%Bow and Twist MAX.0.75%(SMT)Anti-strip 0. ... ROHS,UL, Welcome to visit WALBOND ! 4L PCB with BGA and gold finger