This package includes Knockerballs correctly sized for young and elementary aged kids. Looking to provide fun to kids 5 years old to 6 foot tall then this is the one. Great for kid birthday parties, youth team or elementary school events. (*up to 10 ball rental, 25 players maximum, up to 20 ball rental 50 players maximum. Space should be at least 40x40 ft on grass, carpet or court flooring without obstructions, 16 and 20 ball rentals require basketball court sized x2 or soccer field sized space)