Item Specifics: Approved for environments containing certain non-oil based particles. 5n11 cotton filter can be used with 6001-6006 cartridges, fit for 6100、6200、6800、7501 and 7502 mask. Function: Resist Non-Oily Particles Material: High Electrostatic Filter Material Color: White Particulate Cotton Filter: 10.4x 8.3cm Thickness: 0.8cm (1cm=0.39Inches) Package Include: 10/20/50 x 5N11 Cotton Filter Brand Unbranded MPN Does Not Apply Filter Class P100 UPC Does not apply .