The Gas Mask Model KGGMF-15B has a full acrylglass visor which offers a wider visual view and a double filtered respriration system (double cartridge). The filters will be installedon sides. Features Filter included: 1 NBC Filter Cyanogen chloride lifetime: approx. 50 min Inhalation resistance: 186 Paa (30 l/min) Exhalation resistance: 100 Paa (30 l/min) Visual field: not less than 70%, binocular visual fields not less than 60%, below visual field not less than 40% Material: silicon Weight: 0.3 kg Sizes: one-size