1.Cold Foil Stamping: Recommended line thickness ≥ 0.25mm, line spacing ≥ 0.4mm 2.Resolution must be greater than 360dpi or image size larger than 1000 pixels. 3.Color mode: CMYK. 4.File size must include a 3mm bleed. 5.PSD format (source file, to prevent unclear printing). 6.Customers need to provide a single-sided file for each sheet, and file names must include the actual cutting size.