500 PCS CPR One Way Valves for Training Mask, Blue CPR Training Valves Fit Most Masks, Individually Wrapped (Blue)

["TRAINING USE ONLY -This CPR training valves can NOT be used as a life saving instrument","One-Way Valve Design - Allow air flow in one direction only","The Universal Size- The valves for training masks fit all standard CPR masks valves for training masks fit all standard CPR masks","500 Pack - Contains 500 valves per package, not including a CPR training mask. The training valves are single use only and must be discarded and replaced","Individually Wrapped - Each CPR mask valve comes separately packaged for the maximum convenience and portability"]