They are nominally 1/28. Invariably there is some fudging to help the odd body fit the chassis, but it’s generally only +/- half a scale point (ie 1/28.5).
The exception are the Monsters (1/32 or smaller in the case of the original monster body – not sure about the “killer” bodies as I don’t have one), the Monster CJ5 is around 1/18, and the boats range from 1/24 to 1/40.
