Unlike most of my decals, this set (along with 600-GB-1, 2 and 3) is specifically scaled, rather than supplied in "generic" sizes. (Ie. my usual 24", 30", 36" and 48" scale diameters.)
Instead, these decals scale out to the regulation sizes for fighter aircraft when used on 1/600 scale models. I will also be producing "generic" sheets of RAF decals in due course, to suit other aircraft types.
The Type C roundel wasn't mixed with other types as much as earlier versions, so aircraft can generally be done from this one sheet. It rapidly replaced the other types following it's introduction in late 1943, although a fair number of squadrons still used the Type B on top of their aircraft's wings. By 1945, even this practice had largely died out, and almost all aircraft were using Type C roundels.