Non-rebreathing masks and high-concentration oxygen masks with a reservoir bag are designed to deliver high levels of oxygen to patients. The 1000 ml reservoir bag functions as a storage chamber, ensuring a consistent supply of oxygen during inhalation, while one-way valves prevent the rebreathing of exhaled air. The 7-foot kink-resistant oxygen tubing provides a secure and uninterrupted flow of oxygen from the source to the mask. These masks are compatible with standard oxygen regulators and humidifiers. Manufactured from medical-grade, latex-free PVC, they are gentle on the skin and suitable for allergy-sensitive patients. The adjustable elastic strap and aluminum nose clip offer a secure and comfortable fit for adults, while the transparent body enables healthcare professionals to easily monitor the patient during use