The magnets are inconspicuous, dark with very slightly rougher surface, which helps to glue them. The magnetic force is very good. The weight of a magnet is about 3g. By 13mm diameter to fit the excellent manner pedal eye of a bicycle (the thread is usually today 9/16 ") to the signal for cadence to a sensor such as the Garmin speed & cadence sensor GSC10 Best.Nr .: 010-10644-00 send Such sensors often quite clunky magnetic units like secured with a cable tie to the pedal arm -.. visually unacceptable on a beautiful bike These magnets are the solution to an acceptable price.
