cpr resuscitator mask 30:2 disposable first aid skill training face shield breathing mask mouth breath one-way valve tool

item name: cpr mask properties: medical materials & accessorie application: training, school, travel,etc. function: cpr protect material: pvc medical plastic bag size: approx. 5*5cm mask size: approx. 28*18cm mask: one-way color: red, black, blue, yellow, orange, green