This sheet of decals contains three sizes of national markings and numbers for 1/600 scale models.
The North Vietnamese Air Force markings are ~0.7mm tall (x 203), ~0.85 mm tall (x 188), and ~1.0 mm tall (x 138).
There are 40 pairs of 4-digit numbers printed in three different sizes. The three sizes are ~0.6 mm, ~0.8 mm, and ~1.0 mm tall.
These are water slide decals. The graphics are printed on a clear sheet of decal film. The backing paper is blue to aid identification of white decal images. The images must be cut from the decal sheet as they are not individual decals.