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 : C99528C XC11577 TC41817 C41817 WP10655, Kit Includes: 7x Cabin Air Filter, Kit Variations: K54-100540 K54-100835 K54-100994 K54-101153 K54-101471 K54-101630 K54-101650 K54-101688 K54-101726 K54-101764, Part Reference Numbers : C99528C XC11577 CF1432 TC41817 C41817 WP10655