new, double-sided filters allow better breathability; protection against particles; quick and easy connection; simply push the filter into the mask housing until you hear a click; use with 3M™ Secure Click™ 800 Series masks; P3 R particulate filter for use in combination with 3M™ Secure Click™ D8000 Series gas and vapor filter; the design allows for a better field of vision and comfort; 3M™ Secure Click™ - particle filter P3 R, D7935 has CE approval for environments containing solid and liquid particles; use with 3M™ Secure Click™ Series 800 and 3M™ Secure Click™ D8000 Series filters and 3M™ D701 filter holder