They are not too big and not too small. They are just the right size to accommodate themselves on your table or your side shelf. They can even double up as refrigerator magnets.
Most people use a magnet postcard to attach paper notes or other slips of paper holding important details onto their shelves or in their study. Since they are not too big like
car magnets and neither are they too small, they are quite used all over the world for multiple reasons.