2 layersBase material: FR-4 standardBase material thickness: 1.55mmSurface finish: lead-free HALSoldermask colour: blue or blackSilkscreen legend colour: whiteLegend: two sne wlMin Via drill size: 10milMin via pad size: 20milMin pad wlMin clearance: 6milDetailed spec only on request! Small quantities need in regular order for long time business.