To get the best possible print quality we recommend vector files eg. EPS, AI, PDF, SVG. If you only have Bitmap artwork (PNG, JPEG, JPG, TIFF & GIF) ensure the DPI is over 300 at actual size.
One more point- ensure the artwork is in CMYK mode.
Our designer will send you a proof for you to approve before we start manufacture to ensure you will get exactly what you require.