The Federale 102 ball was composed by 13 polygonal panels which were cut and perfectly fitted together by hand sewing. Most of the classic balls at that time were 12 panel models (like the ones used 4 years earlier in the first World Cup) but the Federale 102 brought the innovation of having the laces on a separate panel to inflate the balls. The bladder was enclosed by lace with 6 rows. For the very first time the leather laces of a World Cup ball were replaced by brown cotton, very similar to the ones used on shoes. This represents a small detail but an important improvement — as cotton is much softer than leather, this encouraged players to head the ball more.
Content courtesy of Worldcupballs.info