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Base material: FR-4 Copper thickness: 0.5 ounce Thickness: 1.6mm Type: 4-layer Finish: lead-free HAL Minimum line width: 0.1mm Minimum line space: 0.1mm Minimum hole diameter: 0.2mm Maximum board size: 500 x 600mm Maximum aspect ratio: 1:8 Blind/buried via: yes PTH hole tolerance: ± 0.075mm Solder mask: dark green Dimensions: 325.2 x 177.30mm