This is our smallest offered magnets with a weight of only 0.6g. It can help to place a back side magnet on an underscarf. Then it is under the underscarf. The picture with the underscarf shows this case. The visible magnet is a back side magnet of one of our pins which is hold there by a small underscarf magnet.
So you can simplify to place a back side magnet really without a noticeable increase in weight at places which are more difficult to access. This is an additional help for ladies who are unpracticed with our pins to fix their scarf or hijab.