Each MC-1 gas mask is an authentic piece of Polish military surplus. These gas masks were once standard-issue designed for and used by members of the Polish land forces, which is one of the four service branches of the Sily Zbrojne Rzeczypospolitej Polskiej. Highly sought after by collectors due to their unique style which includes circular glass eyepieces and a speech diaphragm. They were also deemed appropriate for limited protection from nuclear, biological and chemical agents. The set consists of one surplus mask, one standard NATO 40 mm gas mask filter and carry bag. The form-fitting gas mask is constructed from latex rubber with a six-point elastic harness for a tight seal around the face.