Black cassettes -whats that all about

rally200
rally200 Posts: 646
edited June 2009 in The workshop
Due to budgetry constraints I'm looking at buying a SRAM PG820 (only £12! from CRC) for my 8 speed commuter - anyone know what the black coating is ? will it make any difference? will it last?

It does seen to be used as OEM on some low end MTBs

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