This neodymium magnet has been made thinner in the center than on the ends to allow installation directly under the crown gear in cars where extra clearance is required. It also can be useful where you want less magnetic drag on the straights without scarificing downforce in the turns. Fits most Scalextric cars. May require shimming or gluing in place.
PLEASE NOTE: These small magnets are very powerful and can cause serious injury or death if swallowed - keep away from small children.