Dynarex N95 Particulate Respirator Mask - Flat 1 Mask. Dimensions: 3.75" H x 8" W x 0.1" D Weight: 0.32 oz These masks are a an easy form of personal protect for both the healthcare worker and the patient. It prevents the transfer of microorganisms, bodily fluids, and particulate material. This product is rated to prevent TB exposure according to CDC guidelines; it is fluid resistant, NIOSH approved, and does not contain fiberglass. Mask is single use only.