[High Efficiency Filtration]: Our 5N11 premium filter has higher adsorption capacity, layer by layer purification, low breathing resistance, and protects our respiratory health. Respirator filter against particulate matter, dust, paint, cleaning, grinding, sawing, and welding.offering comprehensive respiratory protection. [Wide Compatibility]: The 5N11 Respirator Filter can be used with 6000 series cartridges, 501 filter retainer, and most gas respirators [Regular Replacement]: The reasonable protection time of the filter is 8 hours, when the filter is found to be dirty or the breathing resistance is significantly increased, you should replace it with a new filter in time. There are differences in printing, which does not affect the use Color: White Material: Filter Cotton Package Contents: 80 x gas mask filter 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.