The decals are printed on clear waterslide decal paper. The dark blue background in the picture is only to make the white line deck designs visible to you on the web-page. They very small.  There are multiple designs in multiple sizes. They are specifically sized to fit Navwar ship castings.
 
Also included on the sheet are decks sized specifically to Navwars:
1x Jeanne d'Arc HAC 
2X FOUDRE N292 LSD
2x OURAGON N293 LSD