Your artwork should be saved in 300 DPI resolution. Your files should be saved in CMYK mode before you send them to us for printing. RGB files cannot be printed on professional four color presses. Not every RGB color has a CMYK equivalent, and the result could be more than just subtle color shifts. Click here to know more.
Please don't forget to "rasterize" or "render" your font layers.
Your artwork must have a Bleed (0.125 inch border) around the entire design which is required for cutting. In addition to the Bleed you should also keep a 0.125 inch Safe margin around your design.