*Sealing ring - Silicone

*Breathing valve - ABS+Silicone valve sheet

*Super Elastic Elastic Band - Polyster Polyester Blend

*Head ring - new environmentally friendly PP material

*Elastic belt buckle - environmentally friendly PP material

*Execution standard: GB2890-2009 / EN 140:1998

*Package: box x1 set (1,000)/carton x50 boxes x1

*Can be used with 3100N, 8501N series gas filters

*Can be used with 200, 8500 series particle filters

*Can be used with N7501, N8501 particle filters.