led light circuit board 1.PCB Quality: UL, ISO9001:2008, ROHS compliant, ... -4, CEM-1, Aluminium Base, Rogers, Taconic,etcFinish Board Thickness0.2mm-3.8mm(8mil-150mil)External Copper Thickness35um-210umInternal ... Twist0.70%Min. Solder Mask Bridge0.0635mmDistance Between Line To Board EdgeOutline: 0.25mm V-CUT: 0.40mmImpedance Control Tolerance ... Silver/Gold, OSP,Plate Gold, Gold Finger LED Light Board