SGE 400/3BB GAS MASK KITFull CBRN protection, ready to deploy. The SGE 400 3BB kit includes the gas mask, a sealed CBRN filter, and a drop leg poucheverything you need for chemical, biological, radiological, and nuclear threats. The butyl rubber face seal resists all known chemical agents including mustard gas, while the ballistic rated visor withstands impacts up to 335 MPH. Key Features Butyl Rubber Face Seal Resists all chemical and biological agents including mustard gas