Max Layer: 6 conductive layers (polyimide) 2 conductive layers (polyester) Max Size: up to 600. 0mm x 600. 0mm Base Copper: 1/2 oz. - 0.018mm thick copper 1 oz. - 0.036mm thick copper 2 oz. - 0.071mm thick copper Line Width And Spacing: 0.05mm (2mil) Line&spacing for single layer 0.075mm (3mil) Line&spacing for multi-layer board Dimensional tolerance: Width of conducting wire(W): +/-0.03mm Hole diameter: +/-0. 5mm External dimention: +/-0.05mm We can do 8~12 layers prototype samples.