Color:B Description: Features: 100% brand new and high quality The filter sheet made of 4 layer filter, include activated carbon and breathable fiber cloth. It can effectively prevent dust, exhaust, pollen, gas, chemicals, PM 2.5, fumes and smoke, keep you in good health. Design according to human face, soft texture, good permeability, smooth breathing, comfortable to wear. Convenient to replace: compatible with g-eneral double valve activated carbon dust mask, easy to install. Perfect for running, biking, skiing, cycling, woodworking and other outdoor activities. How to replace the filter cotton sheet: 1. Unfold the dust mask to expose the interior of the filter valve. 2. Open the valves according to the open direction. 3. Remove the value and filter. 4. Repalce a new filter, reverse the above steps, clockwise rotation of the valve,complete. 5. Masks and valves is not included. Specification: Filter: Micro filter, meltblown cotton, activated carbon, non-woven. Valve£ºEnvironmental PP plastic. Mask Size: approx. 14.5x9.7cm(5.71x3.82in) Color Valve£ºBlack Filter£ºgray Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes:£¨Optional£ Set 1: 1 Pair valves Set 2: 1 pcs filter 1 Pair valves Set 3: 10 pcs filter
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