Martin Sports Official Size Sports Ball Pack contains 24 balls. An official size and weight football, basketball, volleyball, and soccer ball each in red, yellow, blue, green, orange and purple. Balls ship deflated to save shipping cost and minimize cardboard usage. Inflate balls with a ball pump and sports ball inflation needle (sold separately). Official size basketballs have a 29.5" circumference and are most suitable for boys 10+ and girls 14+. Official size volleyballs have a 26" circumference and are suitable for use by all ages. Official size footballs are 11" long and are most suitable for ages 14+. Official size soccer balls (also known as size 5) have a 27.5" circumference and are most suitable for ages 12+.