Key Features: CPR Filtershield*. Filtered mouth barrier. The 2cm airway tunnel acts as a bite block assisting the rescuer in maintaining an open airway. The 2cm airway is compatible with most adults. *CPR Filtershield is a trademark of Medical Devices International.Recommended Industries/Use: AgricultureChemicalConstructionFire ProtectionFood ServicesForestryGovernmentLaw EnforcementManufacturingMedicalMilitaryMiningMunicipal ServicesOil and GasPharmaceuticalSteel and MetalsTransportationUtilitiesWeldingNuclearWind Energy