... Biological Agents(expamples-Smallpox,Anthrax,Plague,Ebola,etc). Close fitting soft rubber with excellent respiratory protection, compatible with safety helment or goffles ... of Gas Mask:Name:Double-tank Gas MaskNo.6100Main Material:Rubber facepiece;Actived Carbon FilterColor:lightgreyInhalation resistance:40L/min < 3.5mm ...