These Mask Respirator Filters Can Block 99 Percent Of Toxins

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These Mask Respirator Filters Can Block 99 Percent Of Toxins

"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.

GSHUBB Respirator-Mask Survival Nuclear and Chemical,Full Face Gas ...

Full Face Rubber Mask Respirator Gas Mask with Two Filters - Gas Mask ...