1.1-16 layers, FR4, Au. 2.Short Lead Lime. 3.UL,RoHS,SGS, ISO9001:2000 4.11 years PCB ... High TG FR4,Halogen Free material,CEM-3, Rogers HF material, etc. Layer counts: 1-16 layers Finished Copper Thickness: 0.5-5 ... PTH Hole: 0.1mm Max. Board Thickness/Hole Ratio: 12:1 Min. Solder Mask Bridge: 4mil (Min. SMT Pad Space ... etc. Wrap and twist: ≤0.7% Flammability: 94V-0 PCB for Electronic LED Products