Dragons in this category are enormous, although size varies greatly between heavyweights of different breeds (20–50 ton weight range). The largest British heavyweight, the Regal Copper, weighs a maximum of 50 tons, can be up to long and have a wingspan of . There are also unidentified breeds of dragons and cross-breeds known to be even larger, such that their size can only be described as "immense". A typical middling heavyweight Chinese Celestial/Imperials and the French "Chanson-de-Guerre", both of which weigh in around 20-25