There are two sheets of crosses in this series. One sheet has crosses that are 1 mm to 1.75 mm tall, it also contains some modern tail flashes that are 0.75 mm tall. The other has crosses that are 1.75 mm to 3 mm tall. The crosses do have a white outline. In the accompanying pictures it appears that he white outline overlaps the black cross. The actual decals have a definite black cross with a white outline.
These are water slide decals. The graphics are printed on a clear sheet of decal film. The backing paper may be blue. This aids identification of white decal images. The images must be cut from the decal sheet as they are not individual decals. Sheets are sold separately.