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 : 97025 XC10429 CF1292 PC9957 WP10428, Kit Includes: 4x Cabin Air Filter, Kit Variations: K54-100081 K54-100222 K54-100419 K54-100601 K54-100779 K54-100938 K54-101097 K54-101256 K54-101415 K54-101574, Part Reference Numbers : 97025 XC10429 CF1292 PC9957 WP10428