A cock cage is a chastisty device that surrounds the penis and holds it at a downward angle. The goal is to not allow for masturbation or penile stimulation. It makes an erection uncomfortable and, often, impossible. cock cages are frequently used in BDSM play.
The body of a cock cage is a tube that holds the penis. It is attached to a ring that goes around the penis and scrotum. Some features of a penis cage may include a hole at the tip to allow for urination and vents to allow for long term wear and cleanliness.