A semi-organic implant made mostly of Osteosilicone.
Osteosilicone begins with a silicone skeleton, with stem-cell cultivated bone to fill out the rest. When implanted in a host, it mimics the density of surrounding bone structures. The result will not appear on an X-Ray. This was one of the preferred types of Radiopsychic Broadcasting (RPB) Receiver for high-value targets in Project Moonstruck.