Dutch neutrality triangles (used 1939-41) primarily intended for 1/600 scale aircraft.
These decals are scaled to represent 24", 30", 36" and 48" sizes in 1/600 scale. (Measuring from point to opposite side; the side lengths are a little larger.) This means that the designs are actually 1mm, 1.25mm, 1.5mm and 2mm tall, or quite small, to use the technical term.... Please note that the black border seems relatively thicker on the smaller markings; this is correct, as the real thing was usually painted with a four inch black border regardless of the size of the insignia.