... , High quality, low cost&fast delivery. Welcome To Rigao ElectronicsShenzhen LED board supplier - Contract Manufacturing- Engineering Services- PCB Design & Assembly and ... 4mm ±0.1mm)Bow and twist < 7/1000 Copper Weight Outer Cu weight 0.5oz ~ 3.0ozInner Cu wight 0.5oz ~ 3 ... 1,,FR-2,CEM-1,CEM-3Process Requirements: Solder MaskColorgreen,light green,white,black,dark brown,yellow,red,blueMin. solder mask ...