These Elastomeric Masks Feature A Surprising Built In Microphone
"those / these" are determiners and are used before nouns to refer to a particular group of things / people, e.g. these people / those rules / those buildings. Update: 题主问的是What are those? 然后他.
Microphone for M40/M42 Masks - MOD Armory Edgewood 5-1-3339
