... 4, considerate service high-precision multi-layer FR4 pcb 1-12 layer:FR-4, AluShort lead timeMore than 10 years ... type: FR-4, CEM-1, CEM-3, High TG, FR4 Halogen Free,Board thickness: 0.35mm ... Line Spacing: 4mil (0.1mm)Surface finishing: HASL / HASL lead free, HAL, Chemical tin, Chemical Gold, Immersion Silver/Gold, ... Routing, V-CUTCertificates: UL, ISO 9001, SGS high-precision multi-layer FR4 pcb