All raster files need to be at 300dpi in order to print clearly. Vector files do not have this issue. When sending over a design, check to make sure that they have an acceptable bleed (. Acceptable file formats are:
Print files submitted in RGB color space will be converted to CMYK before printing and minor color shifts may occur. If you are trying to color match, the process will cost several hundred dollars more. If color matching isn't a big deal, then they will be printed on stand gang run. There will be no refunds for color differences on gang run orders. For more info on RGB vs CMYK, click here.