<P> Balls are generally designated for indoor (generally made of leather or absorbent composites), or all - surface use (generally made of rubber or durable composites, also known as indoor / outdoor balls). Indoor balls tend to be considerably more expensive than all - surface balls due to cost of materials . In addition, brand new all - leather indoor balls must be "broken in" first to achieve optimal grip before use in competition . The abrasiveness of asphalt and the dirt and moisture present in an outdoor setting will usually ruin an indoor ball within a very short period of time, which is why an indoor / outdoor ball is recommended for recreational players . Outdoor balls are commonly made from rubber to cope with rougher conditions, and they need to be filled with more air to retain a suitable level of air pressure in colder weather . </P> <P> Different sizes are used for different age groups . The common standards are: </P> <Table> <Tr> <Th> Size </Th> <Th> Type </Th> <Th> Circumference </Th> <Th> Weight </Th> <Th> Notes on basketball </Th> </Tr> <Tr> <Td> 7 </Td> <Td> Men </Td> <Td> 29.5 in (75 cm) (749--780 mm 29.5--30.7 in) </Td> <Td> 22 oz (620 g) (567--650 g 20--23 oz) </Td> <Td> Men and boys ages 15 and up . This is the official size for men's high school, college, and professional . </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Women </Td> <Td> 28.5 in (72 cm) (724--737 mm 28.5--29.0 in) </Td> <Td> 20 oz (570 g) (510--567 g 18--20 oz) </Td> <Td> Boys ages 12 - 14 . Women and girls ages 12 and up . This is the official size for women's high school, college, and professional . </Td> </Tr> <Tr> <Td> 5 </Td> <Td> Youth (North America) Mini (FIBA) </Td> <Td> 27.5 in (70 cm) (690--710 mm 27.2--28.0 in) </Td> <Td> 17 oz (480 g) (470--500 g 17--18 oz) </Td> <Td> Boys and girls ages 9 - 11 years old . This is the standard youth basketball . </Td> </Tr> <Tr> <Td> </Td> <Td> Youth (North America) </Td> <Td> 25.5 in (65 cm) </Td> <Td> 14 oz (400 g) </Td> <Td> Boys and girls ages 5 - 8 years old . </Td> </Tr> <Tr> <Td> </Td> <Td> Mini (North America) </Td> <Td> 22.0 in (56 cm) </Td> <Td> 10 oz (280 g) </Td> <Td> Boys and girls ages 4 - 8 years old . Also known as "mini" basketball . </Td> </Tr> </Table> <Tr> <Th> Size </Th> <Th> Type </Th> <Th> Circumference </Th> <Th> Weight </Th> <Th> Notes on basketball </Th> </Tr>

What is the official size and weight of an nba basketball
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