metal core board: 1. 2.0W aluminum base material 2.anti-yellow white ink 3.free sample 4.UL,SGS,ROHS,ISO9001,IPC ... for your reference: Product Categories:single/double sided board, multi-layer board, high density board, including MLB with blind/buried via holesMain ... silver/tin, plating gold, OSPBoard Thickness:Inner core thickness 0.15-1.5mm, finished board thickness 0.20-3mmCopper Foil Thickness:1 ...