ONE WAY VALVE The emergency face mask is one-way valve that can protect the rescuer during first aid, prevents mouth-to-mouth contact and risk of infection or contamination. High QualityOur CPR masks are made of high quality nylon pouch and polyethylene fiber. Each CPR mask is packaged a nylon keychain pouch ,easy to carry around. Very compactCPR face shield is very compact 2 by 2.1 , nylon keychain with ring, easy to carry around. Perfect for glove compartment, boat, purse, keychain , home, backpack ect. Mutifuntion ToolCPR face mask is both an emergency face shields and a key chain kit that can easy to use. CPR face mask shield apply to a heart attack, drowning, suffocation, or other unexpected events caused by coma and respiratory and cardiac arrest. CPR face mask is a must-have item for all CPR trained personnel to carry with them at all times. ApplicationPerfect for glove compartment, boat, purse, keychain , home, backpack ect.The emergency face mask prevents mouth-to-mouth contact and risk of infection or contamination, can protect the rescuer during first aid.