Breasts
Breasts are separately available body parts that are also known as sculptures in classical art. Breasts can be sculptured by a sculptor or created as a lifecast of a living human being.
Breasts can be used as ornaments; when designed as sex toys, they consist of body-like materials such as silicone gels or TPE.
Breasts do not have skeletal components, but they are considerably more lightweight, cheaper, and easier to maintain than a whole body doll.