These are excellent replacements for Campagnolo brakes of the Classic Nuovo Record era (1970s-80s.) They also fit Mafac and other shoe holders. The dovetail fitting is 12 mm wide, 9 mm at the narrow section. Overall length, 40 mm. Black: Our standard compound which is great for all weather conditions, but designed for dry condition riding. Salmon: Our most famous Salmon compound is also one of our most aggressive compounds for extreme all weather conditions especially in the wet, but still superb in the dry.