Lightweight One-way valve and filter that eliminates blowback or body fluids to the rescuer Packaged in a polybag with CPR instructions CPR Lifeshield effectively prevents mouth to mouth contact during CPR emergencies. This lightweight 6 3/4'' x 6 3/4'' face conforming mask features a one-way valve and filter that eliminates blowback or body fluids to the rescuer. The translucent vinyl also allows monitoring of the patient. Each CPR Lifeshield is packaged in a polybag with CPR instructions. It is small enough to easily fit in your pocket, holster or trauma kit. Ideal during CPR class it is also compatible with CPR mannequins and models. Essential equipment for all first responders.