Roman bullae were enigmatic objects of lead, sometimes covered in gold foil, if the family could afford it. A bulla was worn around the neck as a locket to protect against evil spirits and forces. Bullae were made of differing substances depending upon the wealth of the family.
Before the age of manhood, Roman boys wore a bulla, a neckchain and round pouch containing protective amulets (usually phallic symbols), and the bulla of an upper-class boy would be made of gold. Other materials included leather and cloth.