Since it seems a lot on here don't know what that is.
He's likely referring to what's called a Baoding Ball, which in pairs is used to alleviate stress and pain in the hands. They come in many different sizes based on your hands as well as different weights - I believe they go up to 2lbs.
Keep in mind how big Tyson Fury's hands are.
Here's an image of a pair of Baoding Balls.

Now, here's the problem with Wilder's claim. It would be impossible for that to get by the handwrapping and there's simply no way he would have gotten one in the glove during the fight or between rounds with cameras on them.
Also, when you clench a fist holding one of them it's plain obvious, even for hands Tyson Fury's size. Your hand would look round; every picture even that suspect one showing knuckles through the glove shows flat. It's not possible.
So...is there such a thing as an "egg weight"? Technically, yes.
Could Fury have used one? Absolutely not. It's BS.
He's likely referring to what's called a Baoding Ball, which in pairs is used to alleviate stress and pain in the hands. They come in many different sizes based on your hands as well as different weights - I believe they go up to 2lbs.
Keep in mind how big Tyson Fury's hands are.
Here's an image of a pair of Baoding Balls.

Now, here's the problem with Wilder's claim. It would be impossible for that to get by the handwrapping and there's simply no way he would have gotten one in the glove during the fight or between rounds with cameras on them.
Also, when you clench a fist holding one of them it's plain obvious, even for hands Tyson Fury's size. Your hand would look round; every picture even that suspect one showing knuckles through the glove shows flat. It's not possible.
So...is there such a thing as an "egg weight"? Technically, yes.
Could Fury have used one? Absolutely not. It's BS.

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