Floorball is a type of indoor floor hockey that is played with teams that are co ed and of multiple ages.
The official ball is 72mm in diameter and weighs 23g. It is made out of white plastic and is similar to an American wiffle ball.
USA Floorball – http://www.usafloorball.org/about-floorball/what-is-floorball/
Photo – http://www.blau-weiss-aasee.de/?c=pages&i=278