<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> </Tr> <Tr> <Td> </Td> <Td> Mini (North America) </Td> <Td> 56--57 cm (22--22 in) </Td> <Td> 283 g (10.0 oz) maximum </Td> </Tr> <Tr> <Td> 5 </Td> <Td> Youth (North America) Mini (FIBA) </Td> <Td> 69--71 cm (27--28 in) </Td> <Td> 470--500 g (17--18 oz) </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Women's official </Td> <Td> 72--74 cm (28--29 in) </Td> <Td> 510--567 g (18.0--20.0 oz) </Td> </Tr> <Tr> <Td> 7 </Td> <Td> Men's official </Td> <Td> 74--76 cm (29--30 in) </Td> <Td> 567--650 g (20.0--22.9 oz) </Td> </Tr> </Table> <Tr> <Th> Size </Th> <Th> Type </Th> <Th> Circumference </Th> <Th> Weight </Th> </Tr>

What is the size of a normal basketball
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