Our preferred print file for full color printing is a PDF with 1/8" bleed, CMYK, at 300 to 350 dpi.
Here are some really helpful videos from Creative Guy to explain our printing specs and file requirements...
Please create your files with 1/8" bleed. What's bleed and why do you need it?:
Provide images in CMYK color mode. What does that mean and why doesn't it always match your screen?
Your images, at the size you'd like them printed, should be at least 300 dpi:
What's the difference between digital printing and offset printing?:
Pantone (pms) color designations should NOT be used in full-color jobs: