They are often constructed of metal tubing , with a thin wire attachment penetrating the ear .
Hoop earrings generally come in the form of a hoop of metal that can be opened to pass through the ear piercing .
earrings are often constructed of metal tubing , with a thin wire attachment penetrating the ear .
Hoop earrings generally come in the form of a hoop of metal that can be opened to pass through the ear piercing .