Every individual trained in CPR should carry a CPR mask at all times. CPR masks are essential during CPR or rescue breathing as they aid in preventing the spread of harmful bacteria. One-way valve CPR masks serve as an effective barrier between the rescuer and the patient, enabling life-saving CPR without exposing oneself to infection risks. Each CPR keychain includes a CPR mask and a durable nylon keychain pouch with Limitless Training Branding and 30:2 to remind you what to do when performing CPR.