The Innosonian America Brayden Premium Urethane Adult Lungs are heavy-duty, reusable airway bags designed for Brayden adult CPR training manikins. Constructed from durable, tear-resistant urethane material, these premium lungs are engineered to withstand repeated high-pressure ventilation practice without leaking or degrading. Featuring an integrated non-rebreathing valve mechanism, they direct exhaled air out through the back of the manikin head to prevent cross-contamination and maintain sterile training conditions during multi-student BLS and CPR classes.