CONOR BENN and Chris Eubank Jr face a $100,000 FINE for every pound they weigh in over the 157lb catchweight limit.
The pair are set for a sensational fight for the ages on October 8, almost 30 years after their dads' famous rematch.
The bout is believed to be set at 157lb, meaning Benn will have to jump up 10lb from his usual 147lb weight class.
Eubank Jr on the other hand is a career middleweight at 160lb, who has even campaigned as high as 168lb.
The weight disparity has meant the two will meet between the 154lb light-middleweight and middleweight limit.
And due to Eubank's superior size, a rehydration clause limiting what he can weigh the next morning is also understood to be in place.
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According to Dan Rafael, both boxers face losing $100,000 (£81k) of their purse if they were to come even 1lb above the agreement.
A similar clause was put into the Kell Brook's contract before he beat Amir Khan at a 149lb catchweight in February.
Eubank Jr, 31, and Benn, 25, both campaigned to fight Brook after but the ex-welterweight champion retired following his win over Khan.
Benn has continued to climb the welterweight rankings to build on a first world title shot.
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Eubank Jr meanwhile has grown increasingly frustrated at his lack of championship opportunities.
So he turned his attention to Benn following their fathers' iconic fights in the 1990s.
Eubank Sr won the first epic battle against arch nemesis Nigel, before they drew three years later in 1993.
A trilogy failed to materialise, leaving their prizefighter sons to renew the rivalry over three decades later.
Eubank Jr said: “It’s a fight that’s going to spark the imagination of the British public, that’s what I’m happy about.
"In terms of anticipation, legacy and hype it’s the biggest fight of my career.”
Benn added: “This fight is for the legacy and was an opportunity I felt I couldn't pass up."
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