After initially adopting a plain blue and white roundel, the RAF in the far east mainly switched to a lower visibility dark blue and light blue roundel. This was also standard on Indian aircraft, although Australia mainly stuck to the blue and white.
These decals are scaled to represent 30", 36" and 48" roundels in 1/300 scale. (They're also ideal for large aircraft in 1/600; equivalent to 60", 72" and 96" diameter.) The actual sizes are 2.5mm, 3mm and 4mm.