Materials: high quality silicone Description: 1.The main body is using the high quality silicone which is anti-aging, anti-allergic and easy to clean. The double silicone mask edge is very good for air tightness, parts of mouth and nose can fit various face; 2.PC window is big , anti fog inside and anti friction outside; 3.The threaded interface is very convenient for replace cartridges; 4.Conforms to EN 136:1998,GB2890-2009 standards.
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