The item in question is composed of the penis of a bull. Specifically, it consists of the corpus cavernosum, a spongy tissue that fills with blood during an erection. This tissue is primarily made of collagen and elastin, providing it with its characteristic firmness and flexibility.
Historically, and currently, it serves multiple purposes. It can be utilized as a durable and long-lasting chew for dogs, capitalizing on its high collagen content, which contributes to joint health. Furthermore, in some cultures, it is consumed as food, often prepared in ways that tenderize the tough tissue. The practice reflects resourcefulness in utilizing all parts of the animal.