[Budget-Friendly]: You will receive 50 pieces 5n11 Filter. It is more budget-friendly than single filter. [Filtering Efficiency] ≥ 95%]Our high-quality electrostatic filter cotton has higher adsorption capacity and low respiratory resistance, which can better defend our respiratory health. Respirator cartridges cotton a wide range of nonoily particles such as dust, PM2.5, pollen, welding fumes, etc. [Recommended Usage Time]The particulate filter cotton generally lasts 8 hours. When the filter cotton is damaged or dirty, has a strange smell, or has significantly increased respiratory resistance, you should leave the contaminated area promptly and replace the 5N11 filter cotton. [Compatibility]The 5N11 filter needs to be installed on the 6001 and cannot be used alone. Compatible with 6200/6502/6800/7502/FF402 respirators. Colour:White Material:cotton Package Contents: 50PCS 5N11 Respirator Filter Cotton Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.