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<http://schema.org/description>
"The Box Four Rear Derailleur is the base of Prime 9 Technology that offers an affordable clutch based 1 by 8-speed derailleur that is simple and light; this makes it a perfect candidate for every..."
<https://www.firstmilecycle.com/product/box-four-prime-9-wide-rear-derailleur-405725-1.htm>