Watch: Do the Eagles know how big an NFL football is?

Apparently not.

To be fair, some of those players never see the ball in a typical game. Leave it to the center to get the size right, though. After all, Jason Kelce is one of two players to touch the ball on every offensive snap, quarterback Jalen Hurts being the other.

According to the Pro Football Hall of Fame, the official Wilson football has been used in every NFL game since 1941. The classic Duke patterned ball returned to the playing field in 2006. An NFL football measures 11 inches long with a 22-inch circumference at the midway point. 

With the possible exception of those used by Tom Brady, the air pressure of an NFL ball should be between 12-1/2 psi and 13-1/2 psi. NCAA footballs are slightly smaller (10 inches in length and 21 inches in circumference.)

With the team on a bye until a much anticipated Super Bowl rematch with the Chiefs, the Eagles have plenty of time to brush up on the measurements of NFL footballs.