| http://www.w3.org/ns/prov#value | - hard - however, road debris such as sand or small pieces of grit / stone trapped in a brake block long-term will score through the black finish.The pro-teams have, as ever, beaten them to within an inch of their lives in racing and training and not seen any significant degradation in the braking surfaces other than that caused by the aforementioned small bit of grit etc.We strongly recommend that
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