... controller board with red oil 2, experienced design and copy service 3, fast delivery 4, strictly QC control PCB Specificationproviding OEM ... layer2MaterialFR-4,CEM-1,CEM-3,Hight TG,FR4 Halogen Free,FR-1,FR-23Board thickness0.2mm-7mm4Max.finished board ... 7Min.line spaceing0.075mm(3mil)8Surface finish/treatmentHALS/HALS lead free,Chemical tin,Chemical Gold,Immersion gold Inmersion Silver/Gold,Osp ...