Comes packaged in very classy metal case.
For more information visit:
http://www.bikepro.com/arch_products/freewheels/aregina.shtml
"...6 sprocket combinations:
12/18 - Cogset Type B7,
12/19 - Cogset Type C7,
12/23 - Cogset Type F7,
13/19 - Cogset Type P7,
13/21 - Cogset Type R7,
or
13/23 - Cogset Type S7"
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Working