Captain's Compass brand cut to fit carbon pre-filters. Carbon pre-filter measures: 12” x 12” x 0.2” (Inches). This listing comes with (6) - 12” x 12” x 0.2” inch carbon pre-filters. Captain's Compass carbon pre-filters are not only thicker than leading original equipment manufacturer (OEM) brands, but also cost less. Trap foul odors, dust, dander, pet hair and other airborne particles. We guarantee you will love our carbon pre-filters or your money back. No questions asked. Breathe Easy knowing Captian's Compass has your back. We recommend changing your carbon pre-filters every 1-2 months based on use. Our carbon pre-filter material is proudly made in the USA. Orders are cut, packaged and shipped from Minnesota.