PUR exclusive enhanced HVAC filters up to 99.7% of dust, pollen and contaminants, PUR exclusive weaves are USA-engineered to last up to 15,000 miles, 25% longer than standard performance of 12,000 miles, PUR filter use thick, industrial strength electrostatic media to trap even the tiniest of particles while densely packed activated carbon prevents gases and odours from entering the cabin, Road debris, exhaust fumes, and contaminants undergo filtration through a three-layer system, which includes a dust filter for trapping road debris, a particle-averting filter to block airborne particles, and an adsorption filter for absorbing exhaus, Contains soda combined with carbon cleans the outside air flowing through the ventilation system, Part Reference Numbers : 97169 XC11800 CF12775 CF1408 TC31755 C31755 WP10088, Kit Includes: 4x Cabin Air Filter, Kit Variations: K54-100535 K54-100838 K54-100997 K54-101156 K54-101315 K54-101474 K54-101633 K54-101646 K54-101684 K54-101722, Part Reference Numbers : 97169 XC11800 CF12775 CF1408 TC31755 C31755 WP10088