<Tr> <Th> Thickness </Th> <Td> 2.15 mm (0.085 in) </Td> </Tr> <Tr> <Th> Edge </Th> <Td> 150 reeds </Td> </Tr> <Tr> <Th> Composition </Th> <Td> 91.67% Cu 8.33% Ni </Td> </Tr> <Tr> <Th> Years of minting </Th> <Td> 1794--present </Td> </Tr>

When did they stop making 50 cent coins