Your Best Online Business Partner. 10-500Pcs 5N11 Cotton Filters Replacement for 6200 6800 7502 Respirator Filters. Approved for environments containing certain non-oil based particles. Function: Resist Non-Oily Particles. Material: High Electrostatic Filter Material. Particulate Cotton Filter: 10.4x 8.3cm. Your feedback & suggestion is deeply appreciated, thanks.