These very small copper molagros are hammered in Peru. Beaders & crafters enjoy using this size for small earrings.
Milagros are votive offerings to ask for healing in the Catholic Church. They are made many different ways around the world, but they basically are used as a symbolic image of what needs to be healed. Then hung on the wall behind the saint or on the clothing of the saint inside the church. Devout parishioners make milagros out of what they have - lost wax casting methods or hammering sheets of tin and silver are typical kinds of milagros.