... layer2MaterialFR-4,CEM-1,CEM-3,Hight TG,FR4 Halogen Free,FR-1,FR-2,Aluminum3Board thickness0.2mm-7mm4Max.finished board ... 3mil)7Min.line spaceing0.075mm(3mil)8Surface finish/treatmentHALS/HALS lead free,Chemical tin,Chemical Gold,Immersion gold Inmersion Silver/Gold,Osp ... ServiceProviding OEM service to all sorts of printed circuit board assembly flexible pcb and pcb assembly for Communications systerm