... Min. drilling slot size: 0.6mm Solder mask color: green, black, blue, white, yellow, and matt, etc. Solder mask hardness: 6H Legend ... /Silkscreen Color: white, yellow, black, etc. Surface Treatment: HAL, Lead Free HAL, Immersion gold ... . Wrap and twist: ≤0.7% Flammability: 94V-0 PCB for Mobile phone