Please setup your artwork using the following information.
Bleed (color to the edges) 4.125 x 6.125 - 3/16" safety zone to live matter
No Bleed (white background) 4 x 6 - 1/8" safety zone to live matter
300 DPI - CYMK - Flatten PDF. For double sided Printing submit 2 separate files, Front.pdf and Back.pdf. DO NOT COMBINE INTO 1 PDF.