1.Resolution: Higher than 300 dpi or greater than 1000 pixels, Color Mode: CMYK 2.Cold Foil Stamping: Recommended line thickness ≥ 0.25mm, line spacing ≥ 0.4mm; font size above 8pt label the color code on the corresponding layer. 3.Foil Stamping Layer: Cannot cover the entire design (no borderless designs). 4.File Format: PSD (source file to prevent unclear printing), PNG.