1.1-16 layers, FR4, Au. 2.Short Lead Lime. 3.UL,RoHS,SGS, ISO9001:2000 4.11 years ... Legend/Silkscreen Color: white, yellow, black, etc. Surface Treatment: HAL, Lead Free HAL, Immersion gold, OSP, Immersion tin, Immersion silver, etc ... , thermal shock test, hole resistance test, and micor metallographic section analysis, etc. Wrap and twist: ≤0.7% Flammability: 94V-0 PCB for Electronic LED Products