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Law 2 of the game of football specifies that the ball is:
All ball often becomes heavier during a match played in dry weather, so the weight rule only applies at the start of a game.
The standard ball is a Size 5, smaller sizes are used in lower age group games or for skills training.
Most modern balls are made by stitching together 32 panels of waterproofed leather or plastic: pigskin. This thirty-two panel configuration is similar to a polyhedron known as the truncated icosahedron, although the football is more spherical, as the faces bulge from the pressure of the air inside.
If you are interested in reading more about the history of footballs, have a look on Wikipedia.