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 : R91178 91178 XC10391 CF12002 CF1331 AF1723 PC99156 C38208 WP10178, Kit Includes: 11x Cabin Air Filter, Kit Variations: K54-100033 K54-100174 K54-100297 K54-100418 K54-100623 K54-100808 K54-101126 K54-101285 K54-101444 K54-101603, Part Reference Numbers : R91178 91178 XC10391 CF12002 CF1331 AF1723 PC99156 C38208 WP10178