From verso of card: "(Fire started in Room) The 2 lb. magnesium bomb does not explode, its only object being to start a fire. It will probably penetrate no further than the attic or an upper floor, setting light to anything within a few feet. Vast numbers of these light bombs can be carried by a single aeroplane, and many more fires started than could be dealt with by fire brigades. Householders, with a little training and equipment, can deal with the incendiary bombs and protect their homes and defeat the enemy's object."