The Safeguard Medical SIMBODIES IO Replacement Bones Humeral Head is a high-fidelity clinical training component engineered for intraosseous (IO) access simulation. Manufactured from advanced composite polymers, these inserts accurately replicate the dual-layer anatomical resistance of the cortical bone and inner medullary cavity. They slide smoothly into compatible humeral training shoulders, offering military medics, emergency physicians, and trauma teams the exact tactile feedback and structural resistance felt during real-world proximal humerus needle access.