If the earring gets caught on anything, it releases easily, which can prevent a possible injury to the ear. The fastening is very light and therefore more affordable.
The butterfly backs secure the earrings to the ear slightly less than screw back fastening.
Age recommendation: from 6 months
The butterfly back closure for this type of fastening slides onto the shank (rod) of the earrings. The shank is provided with a notch which holds the butterfly backs in place. This type of closure is especially popular in Western Europe.