Reusable, long-lasting protective set for respiratory protection that is always at hand. Designed for environments with very small particles such as bacteria, viruses, and coarse particles. The set includes a silicone half mask SR 100 (the half mask can be disinfected 4 times a day; in this case, the half mask has a lifespan of 18 months), particle filter P3 SR 510, pre-filter SR 221, and pre-filter holder. Supplied in a resealable box.